SIP changes
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+ * Improved NAT and STUN support.
+ chan_sip now can use port numbers in bindaddr, externip and externhost
+ options, as well as contact a STUN server to detect its external address
+ for the SIP socket. See sip.conf.sample, 'NAT' section.
+ * Added the bindaddr option to gtalk.conf.
+ * Added the ability to specify arguments to the Dial application when using
+ the DUNDi switch in the dialplan.
* The default SIP useragent= identifier now includes the Asterisk version
* A new option, match_auth_username in sip.conf changes the matching of incoming requests.
If set, and the incoming request carries authentication info,