# Pros/Cons of changing defaultexpiry in sip.conf **URL:** \ **Category:** Asterisk Support\ **Created:** [November 28, 2005, 10:10pm UTC](https://community.asterisk.org/t/pros-cons-of-changing-defaultexpiry-in-sip-conf/2777 "2005-11-28T22:10:38Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![rside](https://avatars.discourse-cdn.com/v4/letter/r/94ad74/32.png) [@rside](https://community.asterisk.org/u/rside)\ **Post date:** [November 28, 2005, 10:10pm UTC](https://community.asterisk.org/t/pros-cons-of-changing-defaultexpiry-in-sip-conf/2777/1 "2005-11-28T22:10:38Z")
What are the pros/cons of changing defaultexpiry in sip.conf? We were receving a lot of registration timed out messages with our VoIP provider. Occasionally, we could not receive or initiate calls for short periods of time when we were receiving these messages. I changed defaultexpiry to 300 from the default 120. This seemed to improve things, but did not complete resolve our outage problem. What can go wrong if I change defaultexpiry to 3600? Does this mean that if we lose our Internet connection to our provider, we may not initiate another registration for one hour? Is there a document that describes in details the underlying semantics of changing this value, or any value in sip.conf? (I have read Van Meggelen et. all, but I need more detail) ---
**Author:** ![IronHelix](https://avatars.discourse-cdn.com/v4/letter/i/da6949/32.png) [@IronHelix](https://community.asterisk.org/u/IronHelix)\ **Post date:** [November 29, 2005, 5:15am UTC](https://community.asterisk.org/t/pros-cons-of-changing-defaultexpiry-in-sip-conf/2777/2 "2005-11-29T05:15:52Z")
The advantage of a lower expiery is that your server ‘checks in’ more often. If your IP changes or something like that happens, a more frequent register will make it figure that out and fix it faster. Which provider do you have? If you use a static IP, they can probably put the IP directly into their system so it will always try your box.