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

[Tomasz Zieleniewski]

Hi,

I have the following situation
I use asterisk as o gateway between networks.

What is the reason for such response?
What are the criteria for such evaluation?

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

CHeers
tomasz
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