[Serusers] MSRTC DLL Bug with SER
Jonathan
jbcrisostomo at gmail.com
Wed Aug 18 02:43:27 CEST 2004
Hello Andrew,
It seems im also being troubled by the problem you have perfectly put
into words unlike the one in my email. ^_^
I just want to ask though, because when i use UDP as the protocol in
my rtc profile, this problem does not occur and communication flow
between user A and B goes smoothly.
Do you think there is an explanation behind that? Why would SER/RTCDLL
combination work when it's under UDP and not when using TCP?
I really have no idea, just observations.
Any comments and/or ideas regarding this issue would greatly help.
Thanks alot in advance.
- Jonathan -
On Wed, 18 Aug 2004 09:46:05 +1000, Andrew Mee
<andrew at healthshare.net.au> wrote:
> After much more discovery we have figured out what the issue is with the
> MS RTC 1.2 and SER.
>
> This isn't so much as a bug with SER but with MS RTC 1.2, it is caused
> by MS RTC sending incorrect Request-URI in the headers. This only occurs
> in request routed mode from the callee end.
>
> Take the example:
> RTC Client A SIP Server RTC Client B
> -----INVITE-------------->
> <----100 Trying-----------
> -----INVITE---------------->
> <----100 Trying-------------
> <----180 Ringing---------- <----180 Ringing------------
> <----200 OK w/ INVITE----- <----200 OK w/ INVITE-------
> -----ACK-----------------> -----ACK------------------->
>
> All is fine at this point, however now lets send a message from A to B:
> RTC Client A SIP Server RTC Client B
> ----MESSAGE b at server----> ----MESSAGE b at server---->
> <----200 OK ------------- <----200 OK --------------
>
> All is still fine, However if we send a message back from B to A:
> RTC Client A SIP Server RTC Client B
> <----MESSAGE b at server----
> -----MESSAGE b at server---->
> <----481 Call Leg/T DNE---
> This is obvious because the SER server sees this message as needing to
> go back to B when it should be forwarded to A as per "8.1.1.1
> Request-URI" of the rfc (as far as my understanding on this). This issue
> occurs with BYE commands and possibly other types of commands.
>
> I might add the To: and From: header fields are correct.
>
> Solution to this problem could (or is there an existing way) a
> module/control could be created that checks if the To: field doesn't
> equal the request-uri that the request-uri be changed to the information
> in the To: field?
>
> Yes I agree that while this is a MS RTC problem, I figure this is going
> to be a better/quicker short term solution. I have not tested if this
> problem exists with other SIP servers.
>
> I can send some ngrep logs if anyone likes?
>
> --
> Andrew Mee
>
>
>
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