I found a work around after looking at the NUA code.
For the INVITE:
char empty = '\0';
nua_invite(tech_pvt->nh,
NUTAG_AUTOANSWER(0),
NUTAG_SESSION_TIMER(session_timeout),
TAG_IF(tech_pvt->redirected,
NUTAG_URL(tech_pvt->redirected)),
TAG_IF(!zstr(tech_pvt->user_via),
SIPTAG_VIA_STR(tech_pvt->user_via)),
TAG_IF(!zstr(tech_pvt->rpid),
SIPTAG_REMOTE_PARTY_ID_STR(tech_pvt->rpid)),
TAG_IF(!zstr(tech_pvt->preferred_id),
SIPTAG_P_PREFERRED_IDENTITY_STR(tech_pvt->preferred_id)),
TAG_IF(!zstr(tech_pvt->asserted_id),
SIPTAG_P_ASSERTED_IDENTITY_STR(tech_pvt->asserted_id)),
TAG_IF(!zstr(tech_pvt->privacy),
SIPTAG_PRIVACY_STR(tech_pvt->privacy)),
TAG_IF(!zstr(alert_info), SIPTAG_HEADER_STR(alert_info)),
TAG_IF(!zstr(extra_headers),
SIPTAG_HEADER_STR(extra_headers)),
TAG_IF(sofia_test_pflag(tech_pvt->profile,
PFLAG_PASS_CALLEE_ID), SIPTAG_HEADER_STR("X-FS-Support: "FREESWITCH_SUPPORT)),
TAG_IF(!zstr(max_forwards),
SIPTAG_MAX_FORWARDS_STR(max_forwards)),
TAG_IF(!zstr(route_uri), NUTAG_PROXY(route_uri)),
TAG_IF(!zstr(route), SIPTAG_ROUTE_STR(route)),
TAG_IF(tech_pvt->profile->minimum_session_expires,
NUTAG_MIN_SE(tech_pvt->profile->minimum_session_expires)),
SIPTAG_PAYLOAD_STR(&empty), // see nua_session.c:803
TAG_END());
There is a line in nua_session.c, in the nua_invite_client_request function:
if (sip->sip_payload)
offer_sent = 0; /* XXX - kludge */
That allows you to set the payload in the INVITE instead of an offer, I just
passed a NIL string in as the payload.
In the sofia_handle_sip_i_state function you can get the remote SDP from the OK
by doing the following:
tl_gets(tags,
NUTAG_CALLSTATE_REF(ss_state),
NUTAG_OFFER_RECV_REF(offer_recv),
NUTAG_ANSWER_RECV_REF(answer_recv),
NUTAG_OFFER_SENT_REF(offer_sent),
NUTAG_ANSWER_SENT_REF(answer_sent),
SIPTAG_REPLACES_STR_REF(replaces_str),
SOATAG_LOCAL_SDP_STR_REF(l_sdp), SOATAG_REMOTE_SDP_STR_REF(r_sdp), TAG_END());
When I got the nua_callstate_completing event/state, I sent the ACK using this:
nua_ack(nh,
SIPTAG_CONTACT_STR(tech_pvt->reply_contact),
SOATAG_USER_SDP_STR(tech_pvt->local_sdp_str),
SOATAG_REUSE_REJECTED(1),
SOATAG_ORDERED_USER(1), SOATAG_AUDIO_AUX("cn
telephone-event"),
TAG_IF(sofia_test_pflag(profile,
PFLAG_DISABLE_100REL), NUTAG_INCLUDE_EXTRA_SDP(1)), TAG_END());
It is an ugly work around, but it works for me.
Hope this helps.
Sandeep
On 2010-04-09, at 8:46 AM, Daniel Eli wrote:
>
>>> I was able to generate an INVITE without an SDP by using the
>>> NUTAG_MEDIA_ENABLE(0) tag when I call nua_invite. The downside
>>> of doing that is the soa is disabled.
>
>>> Does anyone know of a better way to start a call with no SDP?
>
> I have the same problem. Following the NUA call mode
> [http://sofia-sip.sourceforge.net/refdocs/nua/nua_call_model.html], I've also
> used the tag NUTAG_MEDIA_ENABLE(0) in nua_invite() to disable sdp, but I
> can't include SDP in the ACK. When I try to do that, an internal error occurs.
>
> My attempt is something like this:
> ...
> nua_ack(nh,
> TAG_IF(tpcc, NUTAG_MEDIA_ENABLE(1)),
> TAG_IF(tpcc,SOATAG_USER_SDP_STR(loc_sdp)),
> TAG_END());
> ...
>
> So, is there any way to perform the Third Party Call Control mode ?
>
> Thanks,
> Daniel.
>
>
>
>
>
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