I am a newbie to
Sofia-Sip and right now I am exploring the SDP/SOA model that Sofia-sip
provides. After going through the documentation and trying different stuff,
I have the following list
of questions:
1. I am currently
using the SOA model as a helper
in which I pass in the remote sdp, create a user sdp and call soa_generate_answer to generate
a local - sdp. However, I saw
there are soa_activate and soa_deactivate functions in the SOA
documentation, how should the
functions be used in Sip
offer/answer protocol?
2. Here is the message I received in my
program
Sender ---> Receiver (my
program)
v=0
o=user1 53655765 2353687637 IN IP4
10.0.0.162
s=-
c=IN IP4
10.0.0.162
t=0 0
m=application 9
TCP/MRCPv2
to send back a response I used
soa_set_params (...) with user sdp as "m=application 1002
TCP/VOIP\n",surprisingly the message gets modified as
below
Receiver--->Sender
v=0
o=-
7572928847019244131 4895308761159947024 IN IP4 10.0.0.127
s=-
c=IN IP4
10.0.0.127
t=0 0
m=application 0 TCP/MRCPv2
9
My question
is, why does the port
number change to 0
and also I see there is an
extra number "9" after the
application media type ?
3. Here is the
way , I am using SOA, am I
doing the right things in
the right order?
sdp_parser parser =
sdp_parse(magic->home,sip->sip_payload->pl_data,
strlen(sip->sip_payload->pl_data),
0);
sdp =
sdp_session(parser);
soa_session_t *ss = soa_create("default", magic->root,
magic);
soa_init_offer_answer(ss);
soa_set_params(ss, SOATAG_RTP_MISMATCH(0),
SOATAG_RTP_SELECT(SOA_RTP_SELECT_COMMON), SOATAG_AUDIO_AUX("telephone-event"),
TAG_END());
soa_set_remote_sdp(ss, sdp, sip->sip_payload->pl_data,
strlen(sip->sip_payload->pl_data));
const char
*user_sdp_msg = "m=application 1002 TCP/VOIP\n";
soa_set_user_sdp(ss, NULL, user_sdp_msg,
strlen(user_sdp_msg));
soa_generate_answer(ss, NULL);
const char *msg;
const sdp_session_t *sdp2;
unsigned int len;
soa_get_local_sdp(ss, &sdp2, &msg, &len);
soa_generate_answer(ss, NULL);
const char *msg;
const sdp_session_t *sdp2;
unsigned int len;
soa_get_local_sdp(ss, &sdp2, &msg, &len);
4. After going over
the documentation, I am not quite sure how to use SOA in my
application. can you provide me of any
examples that shows a way of using the SOA API, I have spent time looking
at soa_test.c, do you have any other
pointers ?
Thanks in
advance
--Chung
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