[Users] awkward loose_route behaviour

Jean-Michel Foucher jean-michel.foucher at wengo.fr
Fri Apr 21 13:03:56 CEST 2006


Hello all,

i'm facing some problems with loose_route, may it be with ACK or BYE
messages.

Here is the situation :

- 2 softphones : let's call them A and B (on different IP addresses :
/A_ip /and/ B_ip/).

A's username is "voip2".

A registers on this platform :

- a stateless SER on /stateless_ip/

- a statefull SER on /statefull_ip/

B registers on another platform that i do not know (see /Bplatform_ip/)

When B calls A, INVITE messages are smoothly forwarded and relayed.

Same case for trying, OK and 180 ringing.

However, when B sends ACK after (INVITE, trying, OK), here is what ser
stateless receives :


ACK sip:voip2@/stateless_ip/ SIP/2.0
Record-Route: <sip:voip2@/Bplatform_ip/;ftag=368e6f71;lr=on>
Via: SIP/2.0/UDP /Bplatform_ip/;branch=0
Via: SIP/2.0/UDP
/B_ip/:64064;received=/B_public_ip/;branch=z9hG4bK-d87543-226b496c2343f701-1--d87543-;rport=2301
Max-Forwards: 69
Route: <sip:/stateless_ip/;lr=on> (****)
Route: <sip:/statefull_ip/;ftag=368e6f71;lr=on> (****)
Route: <sip:/stateless_ip/;lr=on>


this message is loose_routed and then forwarded (loose_route();
forward(uri:host, uri:port);)

and then here is what ser stateless sends to ser statefull :


ACK sip:/stateless_ip/;lr=on SIP/2.0
Record-Route: <sip:voip2@/Bplatform_ip/;ftag=368e6f71;lr=on>
Via: SIP/2.0/UDP /stateless_ip/;branch=0
Via: SIP/2.0/UDP /Bplatform_ip/;branch=0
Via: SIP/2.0/UDP
/B_ip/:64064;received=/B_public_ip/;branch=z9hG4bK-d87543-226b496c2343f701-1--d87543-;rport=2301
Max-Forwards: 16
Route: <sip:/stateless_ip/;lr=on>


Here are my parameters for ser stateless concerning rr module :
modparam("rr", "enable_full_lr", 1)
modparam("rr", "enable_double_rr", 0)
modparam("rr","append_fromtag",0)


Then, there are two things that i don't understand and make confusion to
ser statefull:

- why did (****) Routes disappear ?

- why did ruri changed in ACK message sent to ser statefull?

any help would be appreciated, thanks in advance,

-- 
Jean-Michel Foucher
OpenWengo, the free and multiplatform VoIP client
http://dev.openwengo.com/


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