Guys, I am sure most of you have been through this but this is my first time. I am having a HOLD problem with Polycom where they refuse to work according to the "new" RFC3624 using SDP a attributes (sendonly/recvonly) to indicate hold and keep sending 0.0.0.0 as the old RFC2543. I guess this is a known thing since I've found several hits on Google about it and they even created an option for it on their provisioning material. Unfortunately, it doesn't work. No matter what I set on the <pre> if ((sdp->sdp_connection && sdp->sdp_connection->c_address && !strcmp(sdp->sdp_connection->c_address, "0.0.0.0"))) { switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_WARNING, "RFC2543 from March 1999 called; They want their 0.0.0.0 hold method back.....\n"); sendonly = 2; /* global sendonly always wins */ } João Mesquita