At one point the documentation for sipp 3.1 regarding the default
behavior for unexpected messages states:
"...if no 200 OK message has been received...(and) the unexpected
message is a 4XX or 5XX, SIPp will send an ACK"
At a later point the "online help" (sipp -h) is documented as such:
-nd : No Default. Disable all default behavior of SIPp which
are the following:
- On UDP retransmission timeout, abort the call by
sending a BYE or a CANCEL
- On receive timeout with no ontimeout attribute, abort
the call by sending a BYE or a CANCEL
- On unexpected BYE send a 200 OK and close the call
- On unexpected CANCEL send a 200 OK and close the call
- On unexpected PING send a 200 OK and continue the call
- On any other unexpected message, abort the call by
sending a BYE or a CANCEL
Notice that in this second description there's no mention of sending ACK
under any circumstance.
So, at the very least, it appears to me that there's conflicting info in
the documentation.
The correct response when a 4XX/5XX is rec'd prior to a call being
connected is the first one -- to send ACK.
In fact the current behavior of sipp 3.1 (2009-07-29) is to send BYE.
Here's an excerpt for a single call id from the short message trace file:
2010-02-19 15:52:40:648 1266612760.648841 S
15729-31...@100.0.9.2 CSeq:1 INVITE INVITE
sip:8252007...@10.99.25.253;user=phone SIP/2.0
2010-02-19 15:52:40:649 1266612760.649834 R
15729-31...@100.0.9.2 CSeq: 1 INVITE SIP/2.0 401 Unauthorized
2010-02-19 15:52:40:649 1266612760.649959 S
15729-31...@100.0.9.2 CSeq:1 ACK ACK sip:8252007...@8252007456:5060
SIP/2.0
2010-02-19 15:52:40:850 1266612760.850845 S
15729-31...@100.0.9.2 CSeq:2 INVITE INVITE
sip:8252007...@10.99.25.253;user=phone SIP/2.0
2010-02-19 15:52:40:852 1266612760.852562 R
15729-31...@100.0.9.2 CSeq: 2 INVITE SIP/2.0 100 Trying
2010-02-19 15:52:40:858 1266612760.858710 R
15729-31...@100.0.9.2 CSeq: 2 INVITE SIP/2.0 486 Busy Here
2010-02-19 15:52:40:858 1266612760.858825 S
15729-31...@100.0.9.2 CSeq:3 BYE BYE
sip:8252007...@10.99.25.253;user=phone SIP/2.0
2010-02-19 15:52:40:860 1266612760.860048 R
15729-31...@100.0.9.2 CSeq: 3 BYE SIP/2.0 481 Call/Transaction Does Not
Exist
2010-02-19 15:52:41:358 1266612761.358890 R
15729-31...@100.0.9.2 CSeq: 2 INVITE SIP/2.0 486 Busy Here
2010-02-19 15:52:42:358 1266612762.358308 R
15729-31...@100.0.9.2 CSeq: 2 INVITE SIP/2.0 486 Busy Here
2010-02-19 15:52:44:358 1266612764.358286 R
15729-31...@100.0.9.2 CSeq: 2 INVITE SIP/2.0 486 Busy Here
2010-02-19 15:52:48:358 1266612768.358527 R
15729-31...@100.0.9.2 CSeq: 2 INVITE SIP/2.0 486 Busy Here
2010-02-19 15:52:52:358 1266612772.358358 R
15729-31...@100.0.9.2 CSeq: 2 INVITE SIP/2.0 486 Busy Here
2010-02-19 15:52:56:357 1266612776.357566 R
15729-31...@100.0.9.2 CSeq: 2 INVITE SIP/2.0 486 Busy Here
2010-02-19 15:53:00:357 1266612780.357227 R
15729-31...@100.0.9.2 CSeq: 2 INVITE SIP/2.0 486 Busy Here
2010-02-19 15:53:04:357 1266612784.357154 R
15729-31...@100.0.9.2 CSeq: 2 INVITE SIP/2.0 486 Busy Here
2010-02-19 15:53:08:357 1266612788.357302 R
15729-31...@100.0.9.2 CSeq: 2 INVITE SIP/2.0 486 Busy Here
2010-02-19 15:53:12:356 1266612792.356628 R
15729-31...@100.0.9.2 CSeq: 2 INVITE SIP/2.0 486 Busy Here
I did a search of the mailing list archive on this topic and found one
item which suggested that this was indeed working correctly (.ie sending
ACK) but implied that one must be using one of the default embedded
scenarios (i'm using custom.)
I realize that I can make the call flow correct by handling 4xx/5xx as
optional responses w/ branching etc within my custom scenario file, but
in doing so these become no longer "unexpected" messages and thus don't
show up in the error log, unexpected msg counts etc, which makes it not
so satisfying a solution for me.
- Russ
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