[asterisk-users] Asterisk SIP handling - why 491 Request Pending response

[Terry Wilson]

> What is the reason for such response?

> SIP/2.0 491 Request Pending
> Via: SIP/2.0/UDP  
> 192.168.129.74 
> :5160;branch=z9hG4bK17c3.17db29e7.0;received=192.168.129.74
> Via: SIP/2.0/UDP 192.168.129.74 ;branch=z9hG4bK17c3.23083974.0
> Via: SIP/2.0/UDP 192.168.129.74:5070;branch=z9hG4bK5b33ae78;rport=5070
> From: "IPFon" <sip:0225761853 at 192.168.129.74:5070>;tag=as7217acbc
> To: <sip:tzl at voip.touk.pl>;tag=as7217acbc
> Call-ID: 307fda656066a7e264e85cea0742e601 at 192.168.129.74
> CSeq: 102 INVITE
> User-Agent: Asterisk PBX
> Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY
> Supported: replaces
> Content-Length: 0
> X-Asterisk-HangupCause: Normal Clearing
> X-Asterisk-HangupCauseCode: 16


Asterisk will send a 491 Request Pending when it is currently  
processing an INIVTE on a particular call and it gets another INVITE  
that isn't a retransmission.

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