4 Feb
2011
4 Feb
'11
6:24 p.m.
Daniel,
I have recently had the chance to do some more debug and here is more
information. It appears that the 500 Server Error is generated by
Asterisk as a response to an offending REGISTER request from the
softphone that has an invalid CSeq number. I have attached an excerpt of
a sip trace that shows these messages. The offending REGISTER message
has a CSeq that is lower than that of the earlier REGISTER message with
the same Call-ID.
My questions are
1) Is the response from Asterisk (500 Server Error) valid ? Wouldn't a
4xx Client Failure response be more appropriate ?
2)The source of this error would probably be a bug in the SIP stack of
the soft phone (PJSIP), correct ?
Thanks and Regards,
Vikram.
I had posted
this question earlier on asterisk-users, but didn't
receive any reply, so I'm posting on sr-users in the hope that someone
can provide guidance on how to debug this problem.
Our setup involves a Sip softphone registering with a fresh install of
Asterisk v1.6.0.5 through an outbound proxy (Kamailio v3.1.1).
We observe that about 80% of the time, immediately after startup of the
softphone, when the softphone sends a REGISTER message, Asterisk
replies with a "500 Server error". However, subsequent REGISTER
messages are replied to appropriately (with a 401 Unauthorized).
you should set sip debug on for asterisk in order to get more verbose
output related to the 503 case. I couldn't spot something wrong for
register that got 503. Next ones have two contact headers, but that is
fine in SIP.
Cheers,
Daniel