[SR-Users] no Contact in REFER generated with dlg_bridge

[Klaus Darilion]

Am 25.05.2010 12:25, schrieb Anton Roman:
> Hi all,
>
> I'm trying to implement a Click2Dial service by using the dlg_bridge
> command from the dialog module. Although it works in this case, I found
> two problems in the scenario and I would like to read your opinion about
> them.
>
> 1) Fisrt problem: the REFER generated by Kamailio doesn't contain a
> contact header.  As per RFC 3515, this request should have a Contact
> header. This REFER is not being accepted by a proprietary device. This
> is can be worked around with the append_hf() command from the textops
> module, but I don know if it is a good solution.
>
> 2) The second one arises  when the ACK generated by Kamailio, goes
> through Kamailio (caller and calle involved in click2dial are registered
> on the Kamailio server): the branch of the second  via header  is not
> correctly populated. Its content is '0' when it must be tha same as in
> the INVITE.

AFAIK if the ACK is an ACK to a 2xx response, then the ACK is a new 
transaction and should have a new branch id.

If 0 is a proper branch id is another question (IIRC it is valid with 
RFC2543 but not with 3261).

This is an often raised topic which you can find discussed in the archive.

regards
Klaus