rtpproxy: updated rtpproxy_manage() to handle PRACKs with sdp

(cherry picked from commit 2aa5095252f9434c7c2a63ecb130bdaf1346fde9)

modules/rtpproxy/rtpproxy.c

@@ -1972,7 +1972,7 @@ rtpproxy_manage(struct sip_msg *msg, char *flags, char *ip)
 	method = get_cseq(msg)->method_id;
 
 	if(!(method==METHOD_INVITE || method==METHOD_ACK || method==METHOD_CANCEL
-				|| method==METHOD_BYE || method==METHOD_UPDATE))
+				|| method==METHOD_BYE || method==METHOD_UPDATE || method==METHOD_PRACK))
 		return -1;
 
 	if(method==METHOD_CANCEL || method==METHOD_BYE)
@@ -1993,6 +1993,9 @@ rtpproxy_manage(struct sip_msg *msg, char *flags, char *ip)
 		if(method==METHOD_ACK && nosdp==0)
 			return force_rtp_proxy(msg, flags, (cp!=NULL)?newip:ip, 0,
 					(ip!=NULL)?1:0);
+		if(method==METHOD_PRACK && nosdp==0)
+			return force_rtp_proxy(msg, flags, (cp!=NULL)?newip:ip, 1,
+					(ip!=NULL)?1:0);
 		if(method==METHOD_UPDATE && nosdp==0)
 			return force_rtp_proxy(msg, flags, (cp!=NULL)?newip:ip, 1,
 					(ip!=NULL)?1:0);
@@ -2010,6 +2013,9 @@ rtpproxy_manage(struct sip_msg *msg, char *flags, char *ip)
 		if(msg->first_line.u.reply.statuscode>=300)
 			return unforce_rtp_proxy_f(msg, flags, 0);
 		if(nosdp==0) {
+			if(method==METHOD_PRACK)
+				return force_rtp_proxy(msg, flags, (cp!=NULL)?newip:ip, 0,
+					(ip!=NULL)?1:0);
 			if(method==METHOD_UPDATE)
 				return force_rtp_proxy(msg, flags, (cp!=NULL)?newip:ip, 0,
 					(ip!=NULL)?1:0);