Build tohost on options

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@952 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -4740,7 +4740,10 @@ static int sip_poke_peer(struct sip_peer *peer)
 	}
 	memcpy(&p->sa, &peer->addr, sizeof(p->sa));
 	memcpy(&p->recv, &peer->addr, sizeof(p->sa));
-	strncpy(p->tohost, peer->tohost, sizeof(p->tohost) - 1);
+	if (strlen(p->tohost))
+		strncpy(p->tohost, peer->tohost, sizeof(p->tohost) - 1);
+	else
+		snprintf(p->tohost, sizeof(p->tohost), "%s", inet_ntoa(p->addr.sin_addr));
 
 	/* Recalculate our side, and recalculate Call ID */
 	memcpy(&p->ourip, myaddrfor(&p->sa.sin_addr), sizeof(p->ourip));