Maybe an error in your script. you obviously tried to send a reply using sl_send_reply in response to the ACK. What you really wanted to do was to forward the ACK.
-jiri
At 11:16 PM 12/23/2004, Amozurrutia Jesus wrote:
I double checked and the ACK are ignored by SER.
The log file thows this: Dec 23 13:26:13 sip2 /usr/sbin/ser[21127]: Warning: sl_send_reply: I won't send a reply for ACK!!
Jesus
-----Original Message----- From: Greger V. Teigre [mailto:greger@teigre.com] Sent: Lunes, 20 de Diciembre de 2004 01:43 a.m. To: Amozurrutia Jesus; serusers@lists.iptel.org Subject: Re: [Serusers] Problem with ACK
Are you sure that the ACK stops at ser? The ACKs should just flow through ser. I have seen a similar problem with XLite where Cisco drops the ACK because XLite there is a bug in XLIte's Via parsing. This is a Cisco gateway appending an x-route-tag to via. Turn on debugging (ALL) on Cisco and check if it drops the ACK due to wrong/no branch info in Via. g-)
Amozurrutia Jesus wrote:
I'm implementing the scenario shown below.
/ 0 \ ---/ \ | /_\ | ATA1 |---| ____ _ _ _ _ _____ ______/ | / \ / / / / \ / \ |---| FW |---| IP Net |---| CCM | | ____/ _/_/_/_/ _____/ | | | | | | | | --- --- / \ / \ |NAT| |SER| |-T | | | ___/ ___/
When calling between the CCM (Cisco CallManager) and the ATA, SER simply ignores the call ACK. The ACK looks like:
ACK sip:5559853979*sip1.mcm.net.mx=X.X.71.2+17081@X.X.81.92:5063 SIP/2.0 Via: SIP/2.0/UDP X.X.67.218:5060;branch=z9hG4bK29b2c750 From: "5559852600" sip:5559852600@X.X.67.218;tag=16781758 To: sip:5559853979@mcm.net.mx;tag=2602576443 Date: Tue, 30 Nov 2004 23:53:15 GMT Call-ID: fef8ed00-1da1612d-24d-da4334c8@X.X.67.218 Route: sip:5559853979@X.X.81.94;ftag=16781758;lr Max-Forwards: 70 CSeq: 101 ACK Content-Length: 0
The call flow:
CallManager SIP Server ATA | | | |-- INVITE -------->| | |<-- trying --------| | | |-- INVITE -------->| | |<-- Trying --------| | |<-- Ringing -------| |<-- Ringing -------| | | |<-- OK ------------| |<-- OK ------------| | |-- ACK ----------->| | | |<-- OK ------------| |<-- OK ------------| | |-- ACK ----------->| | | |<-- OK ------------| |<-- OK ------------| | |-- ACK ----------->| | | |<-- OK ------------| |<-- OK ------------| | |-- ACK ----------->| | | |<-- OK ------------| ......My guess is that SER does not accept the URI "5559853979*sip1.mcm.net.mx=X.X.71.2+17081@X.X.81.92:5063" because it contains "*+=" signs ore something similar. When calling from ATA - ATA there is no preoblem because ATAs construct the ACK message different (URI and Rote flipped).
Any ideas?
Thanks in advance,
Jesus
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-- Jiri Kuthan http://iptel.org/~jiri/