I am using pjsip 2.1.0.
With RFC 4028, pjsip sends UPDATE periodically when it is a refresher.
These UPDATE are sent with an empty body (no SDP). My switch responds
200/OK with a SDP. Pjsip considers this answer as an offer and the
negotiator goes to state WAIT_NEGO. But the negotiation is never done
and when an UPDATE is received with a SDP, pjsip refuses to consider it
("Invalid SDP offer/answer state for UPDATE" is displayed) and in the
same way, refuses to send an UPDATE with a SDP.
The workaround I found is, in sip_inv.c, to replace (line 1801)
if (inv->neg == NULL) {
status=pjmedia_sdp_neg_create_w_remote_offer(inv->pool,
NULL,
sdp_info->sdp,
&inv->neg);
} else {
status=pjmedia_sdp_neg_set_remote_offer(inv->pool_prov,
inv->neg,
sdp_info->sdp);
}
With
if (inv->neg == NULL) {
status=pjmedia_sdp_neg_create_w_remote_offer(inv->pool,
NULL,
sdp_info->sdp,
&inv->neg);
} else if (tsx->role == PJSIP_ROLE_UAC &&
rdata->msg_info.msg->line.status.code/100 == 2) {
PJ_LOG(1,(inv->obj_name, "RLE=UAC status=200 Forget"));
return PJ_SUCCESS;
} else {
status=pjmedia_sdp_neg_set_remote_offer(inv->pool_prov,
inv->neg,
sdp_info->sdp);
}
The idea is to forget the SDP if it comes in a 200/OK and is considered
as an offer. But I am not sure there is no side effect.
Thanks
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