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-rw-r--r--pjsip/include/pjsip/sip_transport_udp.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/pjsip/include/pjsip/sip_transport_udp.h b/pjsip/include/pjsip/sip_transport_udp.h
index 77e76657..d0be27e6 100644
--- a/pjsip/include/pjsip/sip_transport_udp.h
+++ b/pjsip/include/pjsip/sip_transport_udp.h
@@ -41,7 +41,9 @@ PJ_BEGIN_DECL
* Start UDP transport.
*
* @param endpt The SIP endpoint.
- * @param local Local address to bind.
+ * @param local Optional local address to bind. If this argument
+ * is NULL, the UDP transport will be bound to arbitrary
+ * UDP port.
* @param a_name Published address (only the host and port portion is
* used). If this argument is NULL, then the bound address
* will be used as the published address.