17 Dec
2004
17 Dec
'04
6:18 p.m.
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(a)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