[Asterisk-Users] SIP expiry time

[HengWee Chin]

Hi,

  I notice that SJPhone is registering to asterisk with an expires of 120 
secs.  However, when I invoke the command "sip show peer [sip id]". I notice 
that the output indicates the expires 427 and the expiry is 900. Can someone 
explain these numbers to me?

I also notice that just before SJPhone re-register, when I try to make a 
call to the SJPhone, asterisk will complain that it is not able to find the 
URL to sip. When I issue the command "sip show peers", I can still see the 
URL in the list of sip registered. After SJPhone re-register, asterisk is 
able to call again. Any Ideas how come there is this behaviour? A bug?

Regards,
Chin