2009/2/8 liu yang <yangliu....@gmail.com>:
> I found a weird problem that <unicast_addr>, <onwer id> <session id>
> specified by application via SOATAG_USER_SDP_STR would be changed as other
> value forcely by sofia internally.
> Went through the stack, I caught the spotted code.
>
> File : soa_static.c
> Function: soa_offer_answer_step()
>
> Code snippet :
>
> if (local->sdp_origin) {
> o->o_username = local->sdp_origin->o_username;
> /* o->o_address = local->sdp_origin->o_address; */
> }
> if (!o->o_address)
> o->o_address = c0;
> local->sdp_origin = o;
>
> if (soa_init_sdp_origin(ss, o, c_address) < 0) {
> phrase = "Cannot Get IP Address for Media";
> goto internal_error;
> }
>
>
> We can see, the code which expects to perform <unicast_addr> copy from user
> sdp to local sdp which is finally used by sofia stack is commented out.
> I don;t know why this is commented. Is there any speicial consideration?
I think our application once used pretty static user SDP (containing
preferences) having a o= line with a fixed IP address because the SDP
syntax required one. The soa code then changed it to IP address
actually found on device.
On more general level, the idea is that the o= is generated by the guy
who is actually generates the SDP. Therefore o= line must be
different in user SDP (preferences) and local SDP (actual
offer/answer). However, perhaps just having different ID on o= line
is enough. Also, I'd thought that o= line is not very important, its
only purpose is to be unique, but apparently many implementations get
shocked if it contains something they consider fishy (like IP6
address).
I have some code that tries to check if the address on o= line is
something su_localinfo() would return, perhaps I should clean it a bit
and push it.
--
Pekka.Pessi mail at nokia.com
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