# Suddenly Extensions registration drop **URL:** \ **Category:** Asterisk SIP\ **Created:** [June 2, 2026, 4:14pm UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099 "2026-06-02T16:14:29Z")\ **Posts on this page:** 20\ **Page:** 1
**Author:** ![darsh720](https://avatars.discourse-cdn.com/v4/letter/d/71c47a/32.png) [@darsh720](https://community.asterisk.org/u/darsh720)\ **Post date:** [June 2, 2026, 4:14pm UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/1 "2026-06-02T16:14:29Z")
Hi Team, We observed that all SIP extensions suddenly dropped and became unavailable at the same time. The Asterisk server itself appears to be running, and port 5060 is listening correctly, but endpoint registrations were lost unexpectedly. Could you please investigate the possible cause, including: - Asterisk service restart/crash - Network or firewall issues - SIP transport/NAT problems - Realtime database or PJSIP configuration issues - Any recent changes on the server This issue affected multiple extensions simultaneously, so it does not appear to be related to individual user devices. Please check the Asterisk logs and let us know the root cause. Also Throw this error : [2026-06-02 12:12:34] ERROR[3880931]: format\_cap.c:368 ast\_format\_cap\_update\_by\_allow\_disallow: Excessive refcount 100000 reached on ao2 object 0x598b98ca4b38 [2026-06-02 12:12:34] ERROR[3880931]: format\_cap.c:368 ast\_format\_cap\_update\_by\_allow\_disallow: FRACK!, Failed assertion Excessive refcount 100000 reached on ao2 object 0x598b98ca4b38 (0) [2026-06-02 12:12:34] ERROR[3880931]: Got 18 backtrace records Thanks. ---
**Author:** ![abalashov](https://sea1.discourse-cdn.com/asterisk/user_avatar/community.asterisk.org/abalashov/32/9179_2.png) [@abalashov](https://community.asterisk.org/u/abalashov)\ **Post date:** [June 2, 2026, 4:22pm UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/2 "2026-06-02T16:22:38Z")
You know this is a free forum for an open-source project, and there’s no one to “please investigate”, “please check” and “let [you] know the root cause”, right? ---
**Author:** ![benphone](https://sea1.discourse-cdn.com/asterisk/user_avatar/community.asterisk.org/benphone/32/8706_2.png) [@benphone](https://community.asterisk.org/u/benphone)\ **Post date:** [June 2, 2026, 4:25pm UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/3 "2026-06-02T16:25:59Z")
> [@darsh720](#): > > Got 18 backtrace records get these “Got 18 backtrace records” will hep to debug ---
**Author:** ![Pooh](https://avatars.discourse-cdn.com/v4/letter/p/f05b48/32.png) [@Pooh](https://community.asterisk.org/u/Pooh)\ **Post date:** [June 2, 2026, 4:27pm UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/4 "2026-06-02T16:27:59Z")
On Tuesday 02 June 2026 at 18:18:41, darsh720 wrote: > Hi Team, > Could you please investigate the possible cause, including: This is not a commercial support service. We are volunteers who know about Asterisk and are willing to help people who have problems with Asterisk, and who provide sufficient information about those problems to enable us either to reproduce them or at least to understand what happened on the affected system at the time the problem occurred. Please provide sufficient information, and someone may be able to help you. Given what you have said so far about the problem, I suspect a network packet capture of SIP registration attempts and responses would be a good start, but please do not restrict yourself only to that. Anything which you think could be helpful might be helpful… Also, please let us know things like: - which version of Asterisk? - which Linux system is it running on? - what type/s of telephones are you using? - how many are affected? - how often does this happen? - are the telephones on a local network (no intervening routers) to the Asterisk server or are they remote (in which case, give us an overview of the network configuration)? Antony. – “Remember: the S in IoT stands for Security.” - Jan-Piet Mens ---
**Author:** ![darsh720](https://avatars.discourse-cdn.com/v4/letter/d/71c47a/32.png) [@darsh720](https://community.asterisk.org/u/darsh720)\ **Post date:** [June 2, 2026, 4:33pm UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/5 "2026-06-02T16:33:06Z")
You’re right, and I apologize for the wording. I’m looking for guidance from the community to help identify the cause of the issue, not expecting anyone to provide formal support. The problem I observed is that all SIP extensions suddenly became unavailable at the same time, while Asterisk was still running. I’m gathering logs, packet captures, and additional diagnostic information to better understand what happened. I appreciate any suggestions on what information would be most useful to provide for troubleshooting. Thank you. ---
**Author:** ![darsh720](https://avatars.discourse-cdn.com/v4/letter/d/71c47a/32.png) [@darsh720](https://community.asterisk.org/u/darsh720)\ **Post date:** [June 2, 2026, 4:33pm UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/6 "2026-06-02T16:33:46Z")
grep -i “backtrace” /var/log/asterisk/full grep: /var/log/asterisk/full: No such file or directory ---
**Author:** ![darsh720](https://avatars.discourse-cdn.com/v4/letter/d/71c47a/32.png) [@darsh720](https://community.asterisk.org/u/darsh720)\ **Post date:** [June 2, 2026, 4:40pm UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/7 "2026-06-02T16:40:15Z")
Thank you for the clarification. Here are some additional details: - Asterisk Version: 22.8.2 - OS: Ubuntu 24.04 - Phones: SIP softphones and desk phones - Number of affected extensions: All registered extensions - Network: Extensions are remote and register over the Internet What happened: - All extensions were registered and working normally. - Suddenly all endpoints became unavailable. - Asterisk service was still running. - SIP port 5060 was listening correctly. - `pjsip show contacts` continued to show contacts, but `pjsip show endpoints` returned no endpoints after the issue occurred. - Some log messages included “write() failed: Broken pipe”. Thank you. ---
**Author:** ![darsh720](https://avatars.discourse-cdn.com/v4/letter/d/71c47a/32.png) [@darsh720](https://community.asterisk.org/u/darsh720)\ **Post date:** [June 2, 2026, 8:41pm UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/8 "2026-06-02T20:41:46Z")
[2026-06-02 11:53:35] ERROR[3870485]: format\_cap.c:279 ast\_format\_cap\_append\_from\_cap: Excessive refcount 100000 reached on ao2 object 0x598b98ca4b38 [2026-06-02 11:53:35] ERROR[3870485]: format\_cap.c:279 ast\_format\_cap\_append\_from\_cap: FRACK!, Failed assertion Excessive refcount 100000 reached on ao2 object 0x598b98ca4b38 (0) Due to these ERROR possible to all extensions registration drop suddenly ??? and pjsip show endpoints is empty where as pjsip show contacts show all Avail status ---
**Author:** ![jcolp](https://sea1.discourse-cdn.com/asterisk/user_avatar/community.asterisk.org/jcolp/32/8848_2.png) [@jcolp](https://community.asterisk.org/u/jcolp)\ **Post date:** [June 2, 2026, 8:49pm UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/9 "2026-06-02T20:49:58Z")
@darsh720 Please do not open new threads for the same thing. I’ve merged your new one into here. ---
**Author:** ![david551](https://avatars.discourse-cdn.com/v4/letter/d/3bc359/32.png) [@david551](https://community.asterisk.org/u/david551)\ **Post date:** [June 3, 2026, 8:20am UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/10 "2026-06-03T08:20:15Z")
> [@darsh720](#): > > Also Throw this error : > [2026-06-02 12:12:34] ERROR[3880931]: format\_cap.c:368 ast\_format\_cap\_update\_by\_allow\_disallow: Excessive refcount 100000 reached on ao2 object 0x598b98ca4b38 There is no assertion on that line in version 22.8.2! This output is inconsistent with the claimed version unless format\_cache\_get is a macro. > ---
**Author:** ![netygeek1](https://avatars.discourse-cdn.com/v4/letter/n/eada6e/32.png) [@netygeek1](https://community.asterisk.org/u/netygeek1)\ **Post date:** [June 3, 2026, 10:00pm UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/11 "2026-06-03T22:00:44Z")
[2026-06-03 12:04:21] ERROR[89424] format\_cap.c: Excessive refcount 100000 reached on ao2 object 0x598b98ba15d8 [2026-06-03 12:04:21] ERROR[89424] format\_cap.c: FRACK!, Failed assertion Excessive refcount 100000 reached on ao2 object 0x598b98ba15d8 (0) [2026-06-03 12:04:21] ERROR[89424] : Got 18 backtrace records # 0: /usr/sbin/asterisk(\_\_ao2\_ref+0x2df) [0x598b949ca56f] # 1: /usr/sbin/asterisk(+0x75716) [0x598b949cd716] # 2: /usr/sbin/asterisk(\_\_ao2\_find+0x2a) [0x598b949cd85a] # 3: /usr/sbin/asterisk(\_\_ast\_format\_cache\_get+0x3b) [0x598b94a65e1b] # 4: /usr/sbin/asterisk(ast\_format\_cap\_update\_by\_allow\_disallow+0x2ce) [0x598b94a67bee] # 5: /usr/sbin/asterisk(aco\_process\_var+0x6a) [0x598b94a3cc9a] # 6: /usr/sbin/asterisk(ast\_sorcery\_objectset\_apply+0x9d) [0x598b94afc43d] # 7: /usr/lib/asterisk/modules/res\_sorcery\_realtime.so(+0x2e6a) [0x715ed90a6e6a] # 8: /usr/lib/asterisk/modules/res\_sorcery\_realtime.so(+0x3391) [0x715ed90a7391] # 9: /usr/sbin/asterisk(ast\_sorcery\_retrieve\_by\_regex+0x104) [0x598b94afcfe4] #10: /usr/lib/asterisk/modules/res\_pjsip.so(+0x32ad4) [0x715eca0a9ad4] #11: /usr/lib/asterisk/modules/res\_pjsip.so(ast\_sip\_cli\_traverse\_objects+0x49e) [0x715eca0a887e] #12: /usr/sbin/asterisk(ast\_cli\_command\_full+0x1f9) [0x598b94a36d39] #13: /usr/sbin/asterisk(ast\_cli\_command\_multiple\_full+0x7f) [0x598b94a3705f] #14: /usr/sbin/asterisk(+0x6ea7c) [0x598b949c6a7c] #15: /usr/sbin/asterisk(+0x1def55) [0x598b94b36f55] #16: /lib/x86\_64-linux-gnu/libc.so.6(+0x9caa4) [0x715edd29caa4] #17: /lib/x86\_64-linux-gnu/libc.so.6(+0x129c6c) [0x715edd329c6c] [2026-06-03 12:04:21] ERROR[89424] format\_cap.c: Excessive refcount 100000 reached on ao2 object 0x598b98bc0c28 [2026-06-03 12:04:21] ERROR[89424] format\_cap.c: FRACK!, Failed assertion Excessive refcount 100000 reached on ao2 object 0x598b98bc0c28 (0) [2026-06-03 12:04:21] ERROR[89424] : Got 18 backtrace records # 0: /usr/sbin/asterisk(\_\_ao2\_ref+0x2df) [0x598b949ca56f] # 1: /usr/sbin/asterisk(+0x75716) [0x598b949cd716] # 2: /usr/sbin/asterisk(\_\_ao2\_find+0x2a) [0x598b949cd85a] # 3: /usr/sbin/asterisk(\_\_ast\_format\_cache\_get+0x3b) [0x598b94a65e1b] # 4: /usr/sbin/asterisk(ast\_format\_cap\_update\_by\_allow\_disallow+0x2ce) [0x598b94a67bee] # 5: /usr/sbin/asterisk(aco\_process\_var+0x6a) [0x598b94a3cc9a] # 6: /usr/sbin/asterisk(ast\_sorcery\_objectset\_apply+0x9d) [0x598b94afc43d] # 7: /usr/lib/asterisk/modules/res\_sorcery\_realtime.so(+0x2e6a) [0x715ed90a6e6a] # 8: /usr/lib/asterisk/modules/res\_sorcery\_realtime.so(+0x3391) [0x715ed90a7391] # 9: /usr/sbin/asterisk(ast\_sorcery\_retrieve\_by\_regex+0x104) [0x598b94afcfe4] #10: /usr/lib/asterisk/modules/res\_pjsip.so(+0x32ad4) [0x715eca0a9ad4] #11: /usr/lib/asterisk/modules/res\_pjsip.so(ast\_sip\_cli\_traverse\_objects+0x49e) [0x715eca0a887e] #12: /usr/sbin/asterisk(ast\_cli\_command\_full+0x1f9) [0x598b94a36d39] #13: /usr/sbin/asterisk(ast\_cli\_command\_multiple\_full+0x7f) [0x598b94a3705f] #14: /usr/sbin/asterisk(+0x6ea7c) [0x598b949c6a7c] #15: /usr/sbin/asterisk(+0x1def55) [0x598b94b36f55] #16: /lib/x86\_64-linux-gnu/libc.so.6(+0x9caa4) [0x715edd29caa4] #17: /lib/x86\_64-linux-gnu/libc.so.6(+0x129c6c) [0x715edd329c6c] What is the error ? Can explain something about this We are running: asterisk 22.8.2 Ubuntu 24.04 When these errors are come so all extensions registrations are drop so what is solution to up it again ? and what is the reason behind that ?? Help me out for this ? ---
**Author:** ![jcolp](https://sea1.discourse-cdn.com/asterisk/user_avatar/community.asterisk.org/jcolp/32/8848_2.png) [@jcolp](https://community.asterisk.org/u/jcolp)\ **Post date:** [June 3, 2026, 10:03pm UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/12 "2026-06-03T22:03:01Z")
@netygeek1 @darsh720 You are both pasting the same thing. If you are the same person or work for the same company, don’t keep creating new threads. Use this same one. Also if you’re the same person, don’t create multiple accounts. ---
**Author:** ![david551](https://avatars.discourse-cdn.com/v4/letter/d/3bc359/32.png) [@david551](https://community.asterisk.org/u/david551)\ **Post date:** [June 4, 2026, 12:34am UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/13 "2026-06-04T00:34:22Z")
You either have a resource leak, in which case it is strange as to why others haven’t reported it (are you using third party code, or one of the APIs?) or you have an exceptionally large number of some entity in your system which needs to hold a reference to a media format. I’m not sure exactly what would hold such references, but without going through the code, I guess that active channels and endpoint definitions might do so. I’m assuming that the round number of 10,000 means it has changed that it is exactly one over the limit, so this isn’t the result of random memory corruption. Does this start happening at approximately the same amount of time after Asterisk has been restarted? ---
**Author:** ![netygeek1](https://avatars.discourse-cdn.com/v4/letter/n/eada6e/32.png) [@netygeek1](https://community.asterisk.org/u/netygeek1)\ **Post date:** [June 4, 2026, 9:42am UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/14 "2026-06-04T09:42:41Z")
> [@david551](#): > > Does this start happening at approximately the same amount of time after Asterisk has been restarted? After Restart Asterisk this thing happens about after 16 hours this problem arise again ---
**Author:** ![netygeek1](https://avatars.discourse-cdn.com/v4/letter/n/eada6e/32.png) [@netygeek1](https://community.asterisk.org/u/netygeek1)\ **Post date:** [June 4, 2026, 9:43am UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/15 "2026-06-04T09:43:53Z")
We not use any third party code or api just laravel method to generate dialplan file in /etc/asterisk/ ---
**Author:** ![jcolp](https://sea1.discourse-cdn.com/asterisk/user_avatar/community.asterisk.org/jcolp/32/8848_2.png) [@jcolp](https://community.asterisk.org/u/jcolp)\ **Post date:** [June 4, 2026, 9:45am UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/16 "2026-06-04T09:45:48Z")
You’re using realtime. Is it caching? How many endpoints are there? How many calls per second and concurrent calls? ---
**Author:** ![netygeek1](https://avatars.discourse-cdn.com/v4/letter/n/eada6e/32.png) [@netygeek1](https://community.asterisk.org/u/netygeek1)\ **Post date:** [June 4, 2026, 9:52am UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/17 "2026-06-04T09:52:58Z")
Here right now on 3563 total extensions and online extensions are 1885 extensions are register well. ---
**Author:** ![darsh720](https://avatars.discourse-cdn.com/v4/letter/d/71c47a/32.png) [@darsh720](https://community.asterisk.org/u/darsh720)\ **Post date:** [June 4, 2026, 12:27pm UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/18 "2026-06-04T12:27:16Z")
If i upgrade asterisk version so will possible solve my problem ? ---
**Author:** ![benphone](https://sea1.discourse-cdn.com/asterisk/user_avatar/community.asterisk.org/benphone/32/8706_2.png) [@benphone](https://community.asterisk.org/u/benphone)\ **Post date:** [June 4, 2026, 1:31pm UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/19 "2026-06-04T13:31:08Z")
possible ? for sure worth the try ! ---
**Author:** ![TedM](https://avatars.discourse-cdn.com/v4/letter/t/8e8cbc/32.png) [@TedM](https://community.asterisk.org/u/TedM)\ **Post date:** [June 4, 2026, 2:24pm UTC](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099/20 "2026-06-04T14:24:42Z")
You were asked what type of telephones were in use, and I have not seen a reply to that yet. Also, have you even tried googling for an answer at all? From co-pile-o-p: "In **Asterisk** , a _refcount_ (reference count) is a counter used to track how many parts of the system are currently holding a reference to an object. Asterisk uses the **`astobj2` (ao2)** API for reference-counted objects. If the refcount is wrong, you can get two main classes of bugs: - **Refcount too high** → Object never freed (memory leak). - **Refcount too low** → Object freed too early, leading to _bad magic number_ errors or crashes. ## 1. How Refcounting Works in Asterisk - Every `ao2` object starts with a refcount of **1** when created. - Functions like `ao2_ref(obj, +1)` increase the count, and `ao2_ref(obj, -1)` decrease it. - When the count reaches **0** , the object’s destructor is called and memory is freed. - If code keeps a reference without releasing it, the count never reaches 0 → leak. - If code releases too many times, the object is freed while still in use → crash. ## 2. Debugging Refcount Issues Asterisk has **Reference Count Debugging** mode **1** : ### Enabling in Asterisk 14+ 1. Edit `/etc/asterisk/asterisk.conf` and set: 2. Restart Asterisk. 3. Reproduce the problem. 4. Stop Asterisk **gracefully** : 5. Process the log: 6. Review `/tmp/refs.txt` or attach it to a bug report. > **Note:** The `-n` flag suppresses normal lifetimes so you only see leaks, invalid refs, or skewed lifetimes. ## 3. Example of a Raw Refcount Log From `/var/log/asterisk/refs`: ```auto ``` ##### Copy code `0x7f9dbc002048,+1,19256,chan_sip.c,8651,sip_alloc, **constructor** ,allocate a dialog(pvt) struct` `0x7f9dbc002048,-1,19256,chan_sip.c,28226,handle_request_do,4,throw away dialog ptr` - **`+1` / `-1`** → refcount change - **`constructor` / `destructor`** → object creation/destruction - File, line, and function show where the change happened. ## 4. Common Problems - **Autodestruct warnings** : A channel still has a reference preventing cleanup. - **Bad magic number** : Accessing an object after it’s freed. - **FRACK! Excessive refcount** : Refcount reached absurd values (e.g., 100,000) — often due to loops or repeated `ao2_ref()` without matching `ao2_unref()` **2**. Example FRACK error: ```auto ``` ##### Copy code `ERROR: Excessive refcount 100000 reached on ao2 object 0x563b78882c30` `FRACK!, Failed assertion Excessive refcount 100000 reached` ## 5. Tips for Developers - Always pair `ao2_ref(obj, +1)` with a matching `ao2_ref(obj, -1)`. - Use `refdebug` mode in development to catch leaks early. - Avoid holding references longer than necessary. - When debugging, search the `refs` log for the object address to see its entire lifetime. If you want, I can give you a **step-by-step guide to trace a specific leaked or over-referenced object** in Asterisk using `refcounter.py` so you can pinpoint the exact function causing the problem. Do you want me to prepare that tracing workflow?" I’m not going to bother verifying if any of that is even correct since it’s an AI spew - but - if even half of it is correct, you can run the commands to log this. According to AI spew increasing refcounts mean a memory leak. In My Humble Opinion anyone running that many calls and extensions needs to be doing on a version of Asterisk they have compiled themselves, NOT an apt install thingie. If you are doing this - then it would be very simple to add some extra logging code into asterisk in a few key areas to monitor refcounts - and if you see them increasing forever - you have a leak. Then you try finding this with valgrind. There’s not a lot of asterisk systems with as many extensions as yours out there so a memory leak that you have crop up every 16 hours would likely take months to show on most other systems. In addition, you have said nothing about the underlying network infrastructure. Is your system behind a firewall/address translator or some such that is mucking with SIP? Are your extensions behind something that is mucking with SIP? In general your going to get more help here if you try some rudimentary things to fix it. [Next page](https://community.asterisk.org/t/suddenly-extensions-registration-drop/113099.md?page=2)