update CREDTS file

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@827 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CREDITS

@@ -38,6 +38,8 @@ Klaus-Peter Junghanns - in-band DTMF on SIP and MGCP
 Ross Finlayson - Dynamic RTP payload support
 Mahmut Fettahlioglu - Audio recording, music-on-hold changes, alaw file
        format, and various fixes. Can be contacted at mahmut@oa.com.au
+James Dennis - Cisco SIP compatibility patches to work with SIP service
+       providers. Can be contacted at asterisk@jdennis.net
 
 === OTHER CONTRIBUTIONS ===
 John Todd - Monkey sounds and associated teletorture prompt

channels/chan_sip.c

@@ -4236,9 +4236,10 @@ static int handle_request(struct sip_pvt *p, struct sip_request *req, struct soc
 					}
 				} else if (ast_pickup_call(c)) {
 					ast_log(LOG_WARNING, "Nothing to pick up\n");
+					transmit_response_reliable(p, "503 Unavailable", req);
+					p->alreadygone = 1;
 					ast_pthread_mutex_unlock(&c->lock);
 					ast_hangup(c);
-					transmit_response_reliable(p, "503 Unavailable", req);
 				} else {
 					ast_pthread_mutex_unlock(&c->lock);
 					ast_hangup(c);