diff --git a/channels/chan_iax2.c b/channels/chan_iax2.c
index 41670080f3..8b4df85a5d 100644
--- a/channels/chan_iax2.c
+++ b/channels/chan_iax2.c
@@ -498,6 +498,10 @@ struct chan_iax2_pvt {
 	unsigned short callno;
 	/*! Peer callno */
 	unsigned short peercallno;
+	/*! Negotiated format, this is only used to remember what format was
+	    chosen for an unauthenticated call so that the channel can get
+	    created later using the right format */
+	int chosenformat;
 	/*! Peer selected format */
 	int peerformat;
 	/*! Peer capability */
@@ -1961,7 +1965,7 @@ static int iax2_prune_realtime(int fd, int argc, char *argv[])
 	} else if ((peer = find_peer(argv[3], 0))) {
 		if(ast_test_flag(peer, IAX_RTCACHEFRIENDS)) {
 			ast_set_flag(peer, IAX_RTAUTOCLEAR);
-			expire_registry((void*)peer->name);
+			expire_registry((void *)peer->name);
 			ast_cli(fd, "OK peer %s was removed from the cache.\n", argv[3]);
 		} else {
 			ast_cli(fd, "SORRY peer %s is not eligible for this operation.\n", argv[3]);
@@ -3329,7 +3333,7 @@ static int iax2_getpeertrunk(struct sockaddr_in sin)
 }
 
 /*! \brief  Create new call, interface with the PBX core */
-static struct ast_channel *ast_iax2_new(int callno, int state, int capability, unsigned int delaypbx)
+static struct ast_channel *ast_iax2_new(int callno, int state, int capability)
 {
 	struct ast_channel *tmp;
 	struct chan_iax2_pvt *i;
@@ -3384,9 +3388,7 @@ static struct ast_channel *ast_iax2_new(int callno, int state, int capability, u
 	for (v = i->vars ; v ; v = v->next)
 		pbx_builtin_setvar_helper(tmp, v->name, v->value);
 
-	if (delaypbx) {
-		ast_set_flag(i, IAX_DELAYPBXSTART);
-	} else if (state != AST_STATE_DOWN) {
+	if (state != AST_STATE_DOWN) {
 		if (ast_pbx_start(tmp)) {
 			ast_log(LOG_WARNING, "Unable to start PBX on %s\n", tmp->name);
 			ast_hangup(tmp);
@@ -6843,10 +6845,7 @@ static int socket_process(struct iax2_thread *thread)
 		    (f.frametype == AST_FRAME_IAX)) {
 			if (ast_test_flag(iaxs[fr->callno], IAX_DELAYPBXSTART)) {
 				ast_clear_flag(iaxs[fr->callno], IAX_DELAYPBXSTART);
-				if (ast_pbx_start(iaxs[fr->callno]->owner)) {
-					ast_log(LOG_WARNING, "Unable to start PBX on %s\n", iaxs[fr->callno]->owner->name);
-					ast_hangup(iaxs[fr->callno]->owner);
-					iaxs[fr->callno]->owner = NULL;
+				if (!ast_iax2_new(fr->callno, AST_STATE_RING, iaxs[fr->callno]->chosenformat)) {
 					ast_mutex_unlock(&iaxsl[fr->callno]);
 					return 1;
 				}
@@ -7130,10 +7129,8 @@ retryowner:
 												VERBOSE_PREFIX_4,
 												using_prefs);
 								
-								/* create an Asterisk channel for this call, but don't start
-								   a PBX on it until we have received a full frame from the peer */
-								if (!(c = ast_iax2_new(fr->callno, AST_STATE_RING, format, 1)))
-									iax2_destroy(fr->callno);
+								iaxs[fr->callno]->chosenformat = format;
+								ast_set_flag(iaxs[fr->callno], IAX_DELAYPBXSTART);
 							} else {
 								ast_set_flag(&iaxs[fr->callno]->state, IAX_STATE_TBD);
 								/* If this is a TBD call, we're ready but now what...  */
@@ -7514,7 +7511,7 @@ retryowner2:
 											using_prefs);
 
 							ast_set_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED);
-							if(!(c = ast_iax2_new(fr->callno, AST_STATE_RING, format, 0)))
+							if(!(c = ast_iax2_new(fr->callno, AST_STATE_RING, format)))
 								iax2_destroy(fr->callno);
 						} else {
 							ast_set_flag(&iaxs[fr->callno]->state, IAX_STATE_TBD);
@@ -7542,7 +7539,7 @@ retryowner2:
 							ast_verbose(VERBOSE_PREFIX_3 "Accepting DIAL from %s, formats = 0x%x\n", ast_inet_ntoa(sin.sin_addr), iaxs[fr->callno]->peerformat);
 						ast_set_flag(&iaxs[fr->callno]->state, IAX_STATE_STARTED);
 						send_command(iaxs[fr->callno], AST_FRAME_CONTROL, AST_CONTROL_PROGRESS, 0, NULL, 0, -1);
-						if(!(c = ast_iax2_new(fr->callno, AST_STATE_RING, iaxs[fr->callno]->peerformat, 0)))
+						if(!(c = ast_iax2_new(fr->callno, AST_STATE_RING, iaxs[fr->callno]->peerformat)))
 							iax2_destroy(fr->callno);
 					}
 				}
@@ -8246,7 +8243,7 @@ static struct ast_channel *iax2_request(const char *type, int format, void *data
 	if (cai.found)
 		ast_string_field_set(iaxs[callno], host, pds.peer);
 
-	c = ast_iax2_new(callno, AST_STATE_DOWN, cai.capability, 0);
+	c = ast_iax2_new(callno, AST_STATE_DOWN, cai.capability);
 
 	ast_mutex_unlock(&iaxsl[callno]);