Index: channels/chan_iax2.c
===================================================================
--- channels/chan_iax2.c	(revision 89272)
+++ channels/chan_iax2.c	(working copy)
@@ -5350,7 +5350,7 @@
 return_unref:
 	if (p)
 		peer_unref(p);
-
+	ast_mutex_unlock(&iaxsl[callno]);
 	return res;
 }
 
@@ -6003,7 +6003,7 @@
 
 return_unref:
 	peer_unref(p);
-
+	ast_mutex_unlock(&iaxsl[callno]);
 	return res ? res : send_command_final(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_REGACK, 0, ied.buf, ied.pos, -1);
 }
 
@@ -6042,7 +6042,7 @@
 
 return_unref:
 	peer_unref(p);
-
+	ast_mutex_unlock(&iaxsl[callno]);
 	return res ? res : send_command(iaxs[callno], AST_FRAME_IAX, IAX_COMMAND_REGAUTH, 0, ied.buf, ied.pos, -1);;
 }