[OpenSIPS-Users] Need ideas to tamper with CSeq

[Dave Singer]

Cinthia,

The CSeq needs to be changed before it hits opensips. So you could do
something where if the cancel is not matched, lookup the right cseq
using a memcache lookup (that you stored during the accepted invite)
and send it out to it self with the modified CSeq. I wouldn't be
surprised if this too doesn't work since it would be coming from
itself rather than the ATA like the INVITE. Might be worth a try
though.

Dave

On Wed, Mar 30, 2011 at 5:21 PM, Cindy Leung <cinthia721 at gmail.com> wrote:
> I know I'm doing something bad here.  However, we are having a problem with one of the SIP phones that we support.  When it sends out an INVITE and then CANCEL, the CANCEL is not being forwarded.  We are suspecting that it is caused by a wrong CSeq value.
>
> INVITE #1 gets challenged.
> INVITE #2 accepted.
> CANCEL is sent, but CSeq is the same as the one in INVITE #1.
>
> It is less than ideal for us to contact their support and we'd like to get it fixed asap.  I've tried subst(), remove_hf and append_hf to play with CSeq with no luck.
>
> Any suggestions?  Thanks!
>
>
> Cinthia
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