[cisco-voip] phones at remote site frequent failing over to SRST, wan issue?

[Robert Kulagowski]

tony wrote:
> Hi Matt,
> 
> We are not running remote backups at 1am.  I just wanted to say that
> the phones unregister randomly.  Sometimes it's at 1am, other times
> it could be around 5am.  The worse time is when people are in the
> office and it drops their calls.  To give more details, we have a
> 10Mbps ethernet circuit from the provider and the phones register to
> the singapore cm over the dmvpn tunnel.  Please note that we've only
> seen the vpn tunnel go down a few times.

The call drop issue is why we switched to using H.323, but switching to 
H.323 means that you'll lose Caller Name delivery (if that's even 
available down in Oz)

http://www.cisco.com/en/US/products/ps6441/products_feature_guide09186a008069ad1b.html