22 Jun
2004
22 Jun
'04
9:57 p.m.
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
23 Jun
23 Jun
2:16 p.m.
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
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5:48 p.m.
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(a)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(a)lists.iptel.org
http://lists.iptel.org/mailman/listinfo/serusers
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2 comments
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participants (2)
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Jamie Yukes -
Maxim Sobolev