Support ;rport when we're supposed to support ;rport. Issue #7473.

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@46628 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -5265,7 +5265,8 @@ static int copy_via_headers(struct sip_pvt *p, struct sip_request *req, const st
 			if (rport && *(rport+6) == '=') 
 				rport = NULL;		/* We already have a parameter to rport */
 
-			if (rport && ast_test_flag(&p->flags[0], SIP_NAT) == SIP_NAT_ALWAYS) {
+			/* Check rport if NAT=yes or NAT=rfc3581 (which is the default setting)  */
+			if (rport && ((ast_test_flag(&p->flags[0], SIP_NAT) == SIP_NAT_ALWAYS) || (ast_test_flag(&p->flags[0], SIP_NAT) == SIP_NAT_RFC3581))) {
 				/* We need to add received port - rport */
 				char tmp[256], *end;
 
@@ -5282,9 +5283,6 @@ static int copy_via_headers(struct sip_pvt *p, struct sip_request *req, const st
 				}
 
 				/* Add rport to first VIA header if requested */
-				/* Whoo hoo!  Now we can indicate port address translation too!  Just
-				   another RFC (RFC3581). I'll leave the original comments in for
-				   posterity.  */
 				snprintf(new, sizeof(new), "%s;received=%s;rport=%d",
 					tmp, ast_inet_ntoa(p->recv.sin_addr),
 					ntohs(p->recv.sin_port));

configs/sip.conf.sample

@@ -243,7 +243,7 @@ srvlookup=yes			; Enable DNS SRV lookups on outbound calls
 ;
 ;nat=no				; Global NAT settings  (Affects all peers and users)
                                 ; yes = Always ignore info and assume NAT
-                                ; no = Use NAT mode only according to RFC3581 
+                                ; no = Use NAT mode only according to RFC3581 (;rport)
                                 ; never = Never attempt NAT mode or RFC3581 support
 				; route = Assume NAT, don't send rport 
 				; (work around more UNIDEN bugs)