tree 8cde6fe27e77e1af3eb03254e6a331348042e2a6
parent e5545a697c39fa611fb4cc93fba447a91828436c
author Chung-yih Wang <cywang@google.com> 1279787224 +0800
committer Chung-yih Wang <cywang@google.com> 1279853759 +0800

 Use SIP OPTIONS instead of EMPTY message for keep-alive.

 With the rport information in the response of SIP OPTIONS request,
 we are able to know if the NAT port mapping is changed if a device
 is behind a NAT router. If the mapping is changed, we will trigger
 the registration and set the maximum keep-alive interval measured
 for the keepalive process.

 +fix setRPort() in NIST SIP stack for compatibility.
 +fix the WakupTimer in recaculation of the events.

Change-Id: Ifdb8b5d6fd25d69cb0a1520b23b783000b4f6029