diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 89e52342a1..7e2ebb6763 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -542,7 +542,7 @@ static char global_useragent[AST_MAX_EXTENSION];	/*!< Useragent for the SIP chan
 static int allow_external_domains;	/*!< Accept calls to external SIP domains? */
 static int global_callevents;		/*!< Whether we send manager events or not */
 static int global_t1min;		/*!< T1 roundtrip time minimum */
-static int global_autoframing;          /*!< ?????????? */
+static int global_autoframing;          /*!< Turn autoframing on or off. */
 static enum transfermodes global_allowtransfer;	/*!< SIP Refer restriction scheme */
 
 /*! \brief Codecs that we support by default: */
@@ -11505,11 +11505,12 @@ static void handle_response_invite(struct sip_pvt *p, int resp, char *rest, stru
 	/* RFC3261 says we must treat every 1xx response (but not 100)
 	   that we don't recognize as if it was 183.
 	*/
-	if (resp > 100 && resp < 200 && resp != 180 && resp != 183)
+	if (resp > 100 && resp < 200 && resp!=101 && resp != 180 && resp != 183)
 		resp = 183;
 
 	switch (resp) {
 	case 100:	/* Trying */
+	case 101:	/* Dialog establishment */
 		if (!ast_test_flag(req, SIP_PKT_IGNORE))
 			sip_cancel_destroy(p);
 		check_pendings(p);
@@ -11993,6 +11994,7 @@ static void handle_response(struct sip_pvt *p, int resp, char *rest, struct sip_
 	} else if (ast_test_flag(&p->flags[0], SIP_OUTGOING)) {
 		switch(resp) {
 		case 100:	/* 100 Trying */
+		case 101:	/* 101 Dialog establishment */
 			if (sipmethod == SIP_INVITE) 
 				handle_response_invite(p, resp, rest, req, seqno);
 			break;
@@ -12701,6 +12703,7 @@ static int handle_request_notify(struct sip_pvt *p, struct sip_request *req, str
 		respcode = atoi(code);
 		switch (respcode) {
 		case 100:	/* Trying: */
+		case 101:	/* dialog establishment */
 			/* Don't do anything yet */
 			break;
 		case 183:	/* Ringing: */