[pjsip] Problem receiving reINVITE

[Pedro Gonçalves]

Hi!

First of all, I have to say that I am using PJSIP to negotiate a MSRP 
ICE session (it just has small changes in the encoding of the SDP).

However, I am now experiencing a problem when receiving the re-INVITE: 
the on_rx_offer callback is not called when the re-INVITE is received, 
and  I am not understanding why.
By analysing PJSIP code, I see that the only place where such callback 
is used is in sip_inv.c's *inv_check_sdp_in_incoming_msg* method.
Am I right?

However, that method is called by one of the following:
mod_inv_on_rx_request
inv_respond_incoming_update
inv_handle_update_response
inv_respond_incoming_prack
inv_on_state_calling
inv_on_state_early
inv_on_state_connecting
inv_on_state_confirmed

I don't know which one of these was supposed to be called in the "usual" 
scenario (receive a re-invite after a successful INVITE / 100 / 180 / 
200 / ACK transaction occurred).
Which one is it?

However, the problem seems to be that, in sip_endpoint.c's 
endpt_on_rx_msg, the module *mod_ua_on_rx_request* "consumes" this 
reINVITE [it calls *pjsip_dlg_on_rx_request*, which in turn calls 
*mod_inv_on_rx_request* - but in this method there's an if which checks 
if the method ID is invite (as this is a reINVITE, it is), and returns 
true, thus handling/consuming the reINVITE] before it is sent to one of 
the methods above that would possibly call the desired 
*inv_check_sdp_in_incoming_msg* method, and thus *on_rx_offer callback*.

I attached both the log and the capture I made.

Any help on understanding why the on_rx_offer callback is not being 
called will be greatly appreciated.

Many thanks
Pedro Gonçalves
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