[asterisk-dev] 900 second call drop - 420 Bad Extension error w/ SIP, IOS GW

Kevin P. Fleming kpfleming at digium.com
Mon Dec 21 09:48:17 CST 2009

Jared Mauch wrote:

>     -- Got SIP response 420 "Bad Extension" back from x.x.2.115
>   == Spawn extension (verio-int, 600, 4) exited non-zero on 'SIP/dns.name.hidden-00000064'
> The actual message received is usually something like this:
> SIP/2.0 420 Bad Extension
> Via: SIP/2.0/UDP x.x.27.16:5060;branch=z9hG4bK21db1330;rport
> From: <sip:2149151350 at x.x.27.16>;tag=as22d8cfaf
> To: <sip:2149151356 at x.x.2.115>;tag=6E691D88-4A
> Call-ID: C8B6CF60-D86311DE-93A08FDB-20B8ACA9 at x.x.2.115
> CSeq: 102 INVITE
> Unsupported: timer
> Content-Length: 0

Asterisk is trying to use SIP session-timers for this dialog, presumably
because the other end offered support for them in the initial INVITE.
However, when Asterisk sent a session refresh because the timer was
about to expire, the other end rejected it.

Kevin P. Fleming
Digium, Inc. | Director of Software Technologies
445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
skype: kpfleming | jabber: kpfleming at digium.com
Check us out at www.digium.com & www.asterisk.org

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