Thanks for looking into it.
We are using Chan SIP trunk for making external calls register with Level3 SIP provider.
Asterisk (Ver. 12.8.2), Freepbx version 12.0.76
Please find few sip debug info given below, hope that helps. Please let me know anything else needed. The calls goes on silent exactly at 1.01 sec, the other end user can hear us but we can not hear anything. This is random, out of 10 calls 8 calls have this issue, 2 calls goes well without any issue. It is like one way call. We have to drop the call abruptly and make it again and again to complete the call.
This is impacting our production. Please let me know if any patch needs to be updated. Currently our asterisk is running on Hyper-V virtual machine and has 2 core cpu and 2GB of RAM with 31mpbs bandwidth.
[2015-08-20 11:08:07] VERBOSE[30517] chan_sip.c: Retransmitting #1 (NAT) to 10.39.90.66:5060:
OPTIONS sip:10.39.90.66 SIP/2.0
Via: SIP/2.0/UDP 10.32.11.63:5060;branch=z9hG4bK6db76332;rport
Max-Forwards: 70
From: “Unknown” sip:nla-sip1-in@10.32.11.63;tag=as22476399
To: sip:10.39.90.66
Contact: sip:nla-sip1-in@10.32.11.63:5060
Call-ID: 584193361a036db66c57682500b987f4@10.32.11.63:5060
CSeq: 102 OPTIONS
User-Agent: FPBX-12.0.74(12.8.2)
Date: Thu, 20 Aug 2015 09:08:06 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Content-Length: 0
[2015-08-20 11:08:08] VERBOSE[30517] chan_sip.c: Retransmitting #2 (NAT) to 10.39.90.66:5060:
OPTIONS sip:10.39.90.66 SIP/2.0
Via: SIP/2.0/UDP 10.32.11.63:5060;branch=z9hG4bK6db76332;rport
Max-Forwards: 70
From: “Unknown” sip:nla-sip1-in@10.32.11.63;tag=as22476399
To: sip:10.39.90.66
Contact: sip:nla-sip1-in@10.32.11.63:5060
Call-ID: 584193361a036db66c57682500b987f4@10.32.11.63:5060
CSeq: 102 OPTIONS
User-Agent: FPBX-12.0.74(12.8.2)
Date: Thu, 20 Aug 2015 09:08:06 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Content-Length: 0
[2015-08-20 11:08:09] VERBOSE[30517] chan_sip.c: Retransmitting #3 (NAT) to 10.39.90.66:5060:
OPTIONS sip:10.39.90.66 SIP/2.0
Via: SIP/2.0/UDP 10.32.11.63:5060;branch=z9hG4bK6db76332;rport
Max-Forwards: 70
From: “Unknown” sip:nla-sip1-in@10.32.11.63;tag=as22476399
To: sip:10.39.90.66
Contact: sip:nla-sip1-in@10.32.11.63:5060
Call-ID: 584193361a036db66c57682500b987f4@10.32.11.63:5060
CSeq: 102 OPTIONS
User-Agent: FPBX-12.0.74(12.8.2)
Date: Thu, 20 Aug 2015 09:08:06 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Content-Length: 0
[2015-08-20 11:08:10] VERBOSE[30517] chan_sip.c: Retransmitting #4 (NAT) to 10.39.90.66:5060:
OPTIONS sip:10.39.90.66 SIP/2.0
Via: SIP/2.0/UDP 10.32.11.63:5060;branch=z9hG4bK6db76332;rport
Max-Forwards: 70
From: “Unknown” sip:nla-sip1-in@10.32.11.63;tag=as22476399
To: sip:10.39.90.66
Contact: sip:nla-sip1-in@10.32.11.63:5060
Call-ID: 584193361a036db66c57682500b987f4@10.32.11.63:5060
CSeq: 102 OPTIONS
User-Agent: FPBX-12.0.74(12.8.2)
Date: Thu, 20 Aug 2015 09:08:06 GMT
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE
Supported: replaces, timer
Content-Length: 0
[2015-08-20 11:08:10] VERBOSE[30517] chan_sip.c: Really destroying SIP dialog ‘584193361a036db66c57682500b987f4@10.32.11.63:5060’ Method: OPTIONS