asterisk users - Mar 2009 - Issue with no change of SIP call ID

Good afternoon everybody.


I first would like you to excuse me for my english.


I have an issue with a SIP call ID which is not changed in the call
configuration described bellow :



I have an Asterisk Server A using only SIP protocol.

Behind A there are 2 distant clients (using softphone X-lite) C1 and C2 and a
proxy server OpenSIPS (ex OpenSER) P.

The idea is that when C1 want to call C2, C1 send messages to A which first send
messages to P which sends back messages to A before sending them to C2.



Here are the configuration files I set :

------- sip.conf -------

[general]
directrtpsetup=no
canreinvite=no

bindport=5060
bindaddr=192.168.255.40

tcpenable=no 

useragent=OSBC
sdpsession=OSBC
sdpowner=OSBC

register => cedric1:test at 192.168.255.42/cedric1
register => cedric2:test at 192.168.255.42/cedric2


[client](!)
type=friend
host=dynamic
context=outgoing


[proxy]
type=friend
host=192.168.255.42
context=incoming
qualify=yes
allow=all


[cedric1](client)

[cedric2](client)

-------------------------------

Where 192.168.255.42 is the IP address of P and 192.168.255.40 is the IP address
of A

------- entensions.conf -------

[globals]

[general]

[outgoing]
exten => _[a-zA-Z0-9].,1,Verbose(Outgoing ${EXTEN} - ${CALLERID(all)} -
${CALLINGPRES} - ${CHANNEL} - ${CONTEXT} - ${SIPDOMAIN} - ${SIPCALLID}) exten
=> _[a-zA-Z0-9].,n,Dial(SIP/proxy/${EXTEN})
exten => _[a-zA-Z0-9].,n,Hangup()


[incoming]
exten => _[a-zA-Z0-9].,1,Verbose(Incoming ${EXTEN}) 
exten => _[a-zA-Z0-9].,n,Dial(SIP/${EXTEN},15)
exten => _[a-zA-Z0-9].,n,Hangup()


-------------------------------



I performed lots of tests and I give you the most important results :

If C2 is registering to P instead of A, calls works in both ways (C1 -> A
-> P -> C2 and C2 -> P -> A -> C1)

If C2 is registering to A, here is my problem. I detail you what is exactly
performed by A (thanks to tshark and wireshark) :

C1 sends the invite to Asterisk with a call id "cid-1".
A acts as a B2BUA and initiates an other connexion with P : it send an invite to
P with a call-ID "cid-2".
P knows that C2 is behind A, so it forwards the invite back to A with
"cid-2".

Here is the problem : when A received this invite message, it only forwards the
message to C2 with the same call-id "cid2" instead of acts as a B2BUA
and change call-id.

As a consequence : C2 answers with a 180 response and "cid-2" to A
which answers to C1 (with "cid-1") and never forwards these responses
and all other messages to P.
As P doesn't see response messages, it sends invites messages to C2 again
and again which rings again and again.


I wish you understood me and could help me to solve this problem. 



Best regards


C?dric.


--
C?dric Bonnet
/FT/RO/DPS/CTR/CPM/VASF
Tel. +33 (0) 1 55 88 36 60
cedric.bonnet at orange-ftgroup.com


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