you can create local SDP offer or answer *manually* , then you can set any
IP inside SDP.
something like this
pjmedia_sdp_session *sdp;
pjmedia_sdp_media *m;
pjmedia_sdp_attr *attr;
/* Create and initialize basic SDP session */
sdp = (pjmedia_sdp_session *)pj_pool_zalloc(pool,
sizeof(pjmedia_sdp_session));
SetSDPOrigin(call, sdp);
sdp->name = pj_str("VOXMEDIA");
/* Since we only support one media stream at present, put the
* SDP connection line in the session level.
*/
sdp->conn = (pjmedia_sdp_conn *)pj_pool_zalloc(pool,
sizeof(pjmedia_sdp_conn));
sdp->conn->net_type = pj_str("IN");
sdp->conn->addr_type = pj_str("IP4");
sdp->conn->addr = pj_str(call->local_sdp_audio_ip);
regards,
Gang
On Thu, Sep 18, 2008 at 8:32 PM, Mark Webster <mark.if
webster+pjsip at gmail.com <webster%2Bpjsip at gmail.com>> wrote:
> Just an update to this issue: If I specify the *a_name* of the bind
> address in *pjsip_udp_transport_start*, then the Via: header reflects this
> correctly, but the SDP still advertises the IP of first interface for
> RTP/RTCP (even though I'm not bound to it).
>
> To clarify, the interfaces are on different subnets and the INVITEd party
> can't reach my first interface.
>
> I'm sure I probably need to be doing something different after creating the
> dialog, like *pjsip_dlg_set_transport*, but I can't quite work out how to
> do that. When I use *pjsip_dlg_set_transport* to set the transport to the
> one returned by *pjmedia_transport_udp_create*, it seems to invalidate the
> dialog (although no error is returned).
>
> What am I missing?
>
>
> On Thu, Sep 18, 2008 at 2:25 AM, Mark Webster <
> mark.webster+pjsip at gmail.com <mark.webster%2Bpjsip at gmail.com>> wrote:
>
>> Hello again PJSIP people, forgive me if this has already been properly
>> discussed or documented elsewhere, but I have searched and not found the
>> answer.
>>
>> My app is running on a linux box with multiple interfaces. I'm not using
>> PJSUA, rather just the base PJSIP/MEDIA/etc functions.
>>
>> What happens is during a SIP dialog, the SDP address and Via: fields are
>> always automatically populated with the IP of the first interface. However,
>> I am binding to another interface in *pjsip_udp_transport_start*.
>>
>> Ultimately I will be bridging calls across multiple interfaces, and I need
>> a way of directly controlling the IP in the SDP and Via fields for each
>> invite dialog.
>>
>> Could you point me to documentation or a quick example which explains how
>> to do this?
>>
>> Thanks in advance.
>> Mark
>>
>
>
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