Calls disconnect after exactly 17:28 minutes

[dcitelecom]

we see many calls disconnect after 17:28 and can't figure out why this is happening. Is there a timeout parameter in Asterisk, PIAF or free PBX? We use PIAX 1.755 with Asterisk 1.6 and FrePBX 2.8. Most of our customers use the Grandstream HT286 voip adapter. Any ideas?

 

[atsak]

we see many calls disconnect after 17:28 and can't figure out why this is happening. Is there a timeout parameter in Asterisk, PIAF or free PBX? We use PIAX 1.755 with Asterisk 1.6 and FrePBX 2.8. Most of our customers use the Grandstream HT286 voip adapter. Any ideas?

No, never seen this. What kind of firewall do you have? Are you using SIP or POTS lines?

 

[blanchae]

If it was 17 min 4 sec then that would be 1024 seconds or a counter with 10 bits which is 2^10. Wonder if that is a coincident.

 

[blanchae]

Here's a thread over at the Digium forum's that discusses this and it seems to be a problem with the Grandstream HT286. They do have a solution at the end of the posting. Here's a similar thread over at Grandstream's forum. It seems to be caused by a mismatch between the session timers.

 

[blanchae]

From Vocal Technologies Ltd:

SIP provides a mechanism by which both user agents and proxies can determine whether a given SIP session is still active. This mechanism is referred to as a Session Timer and is described in RFC 4028 "Session Timers in SIP". This specification defines a keepalive mechanism for SIP sessions. In a SIP session that utilizes a session timer, UAs send periodic re-INVITE or UPDATE requests to refresh the session. The interval at which these session refreshers are sent and which UA is responsible for sending them is negotiated in the initial INVITE transaction that sets up the session. If a session refresher request is not received before the negotiated interval expires, both the UAS and UAC should send a BYE and any proxies in between can remove any state maintained for the session.

Here's a paper on everything you want to know about Asterisk's SIP session timers.

 

[dad311]

Here's a thread over at the Digium forum's that discusses this and it seems to be a problem with the Grandstream HT286. They do have a solution at the end of the posting. Here's a similar thread over at Grandstream's forum. It seems to be caused by a mismatch between the session timers.

I had a Grandstream phone that would disconnect after about seventeen minutes. Seemed to happen most when a conference call was muted (no tx audio).

 

[dcitelecom]

Thanks guys. Right on the money. This forum is great.