[asterisk-users] Request Pending retransmitions

[Klaus Darilion]

Are you using newest Asterisk versions? There were some similar problems 
fixed recently:
https://issues.asterisk.org/view.php?id=13849
https://issues.asterisk.org/view.php?id=14239
https://issues.asterisk.org/view.php?id=14584

regards
klaus

Guillén Melo, Joaquin schrieb:
> Hi, im trying to build a UAC and I'm coming up with some trouble 
> whenever I receive a SIP 491 Request Pending Response. This happens 
> because I try to place a call on hold using an Invite request rigth 
> before Asterisk sends me a Re-Invite for the same call. I respond to the 
> 491 response with an ACK however for some strange reason Asterisk 
> doesn't accept the ACK and insists on retransmitting the 491 Response. 
> Asterisk replies with the following 491 response:
> 
> SIP/2.0 491 Request Pending
> Via: SIP/2.0/UDP 
> 10.110.7.89:5070;branch=z9hG4bK5a668c33f196837c3602266b23b389e0;received=10.110.7.89 
> 
> From: <sip:30001 at 10.110.7.20:5070>;tag=SIPTester
> To: <sip:30008 at 10.110.7.20>;tag=as2ea72122
> Call-ID: 0dd43bb5a64eb5a2fb0114193821f037 at 10.110.7.89
> CSeq: 5 INVITE
> User-Agent: Asterisk PBX
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
> Supported: replaces
> Content-Length: 0
> X-Asterisk-HangupCause: Normal
> 
> 
> 
> And I send the following ACK:
> 
> 
> 
> ACK sip:30008 at 10.110.7.20 SIP/2.0
> Call-ID: 0dd43bb5a64eb5a2fb0114193821f037 at 10.110.7.89
> Max-Forwards: 70
> From: <sip:30001 at 10.110.7.20:5070>;tag=SIPTester
> To: <sip:30008 at 10.110.7.20>;tag=as2ea72122
> Via: SIP/2.0/UDP 
> 10.110.7.89:5070;branch=z9hG4bK5a668c33f196837c3602266b23b389e0
> CSeq: 5 ACK
> Content-Length: 0
> 
> However this doesn't seem to be valid because Asterisk insists be 
> resending the same 491 Response until it sends 6 messages and the 
> decides to destroy the dialog:
> 
> Aug 21 11:21:06 <http://www.voip-info.org/boards/Aug%2021%2011:21:06> 
> WARNING9686 <http://www.voip-info.org/boards/9686>: chan_sip.c:1967 
> retrans_pkt: Maximum retries exceeded on transmission 
> 0dd43bb5a64eb5a2fb0114193821f037 at 10.110.7.89 for seqno 5 (Critical 
> Response) — See doc/sip-retransmit.txt.
> Aug 21 11:21:06 <http://www.voip-info.org/boards/Aug%2021%2011:21:06> 
> WARNING9686 <http://www.voip-info.org/boards/9686>: chan_sip.c:1989 
> retrans_pkt: Hanging up call 
> 0dd43bb5a64eb5a2fb0114193821f037 at 10.110.7.89 - no reply to our critical 
> packet (see doc/sip-retransmit.txt).
> 
> Does anyone have a clue of what it is I'm doing wrong? Do I have to send 
> a CANCEL request of the hold's INVITE?
> 
> Thanks in advance!
> 
>  
> 
> **Joaquín **
> 
>  
> 
> 
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