I have a user agent that does not ACK after 200 OK. Is it possible to configure SER to generate an ACK and reply to 200 OK?
broken UA ---- INVITE ---> ser <---- 100 ------- ser ---- INVITE ---> gateway 183 183 ser <--- 200 OK---- gateway broken UA <---- 200 ----- ser <------ 2 way RTP ----------->
Call is mostly established, but broken UA does not ACK the 200 OK. Can we generate the following packet? ser --- ACK ---> gateway
This would allow the broken UA to interop. Can SER generate this ACK?
Thanks, Jamie Yukes
That would be a very wrong thing to do, since calee will have no way to tell if no-ACK situation has been caused by the loss of 200 OK in transit, in which case it has to re-transmit 200 OK, or by the b0rken UAC, that don't send ACK after receiving 200 OK. Therefore, such "fixup" will undermine non-broken UAs in the presence of packets loss, which is unavoidable in the case when UDP is used.
The only way to address this problem is to seek resolution from the phone vendor.
Regards,
Maxim
Jamie Yukes wrote:
I have a user agent that does not ACK after 200 OK. Is it possible to configure SER to generate an ACK and reply to 200 OK?
broken UA ---- INVITE ---> ser <---- 100 ------- ser ---- INVITE ---> gateway 183 183 ser <--- 200 OK---- gateway broken UA <---- 200 ----- ser <------ 2 way RTP ----------->
Call is mostly established, but broken UA does not ACK the 200 OK. Can we generate the following packet? ser --- ACK ---> gateway
This would allow the broken UA to interop. Can SER generate this ACK?
Thanks, Jamie Yukes
Serusers mailing list serusers@lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers
Good points. Well, now I'm working with a UA that does not ACK 487, Anyway, does anyone know how to do this?
# the following is for UAs who are known to have broken handling to 487 onreply_route[3] { if ( status =~ "487" ) { # t_release( ); # this doesn't work here } }
On Wed, 23 Jun 2004 14:16:17 +0300, Maxim Sobolev sobomax@portaone.com wrote:
That would be a very wrong thing to do, since calee will have no way to tell if no-ACK situation has been caused by the loss of 200 OK in transit, in which case it has to re-transmit 200 OK, or by the b0rken UAC, that don't send ACK after receiving 200 OK. Therefore, such "fixup" will undermine non-broken UAs in the presence of packets loss, which is unavoidable in the case when UDP is used.
The only way to address this problem is to seek resolution from the phone vendor.
Regards,
Maxim
Jamie Yukes wrote:
I have a user agent that does not ACK after 200 OK. Is it possible to configure SER to generate an ACK and reply to 200 OK?
broken UA ---- INVITE ---> ser <---- 100 ------- ser ---- INVITE ---> gateway 183 183 ser <--- 200 OK---- gateway broken UA <---- 200 ----- ser <------ 2 way RTP ----------->
Call is mostly established, but broken UA does not ACK the 200 OK. Can we generate the following packet? ser --- ACK ---> gateway
This would allow the broken UA to interop. Can SER generate this ACK?
Thanks, Jamie Yukes
Serusers mailing list serusers@lists.iptel.org http://lists.iptel.org/mailman/listinfo/serusers
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Jamie Yukes -
Maxim Sobolev