> Our issue with calls suddenly disconnecting after 18 secs has 
> been fixed.
> 
> However, it appears another problem that I initially thought 
> was linked to this is not.  We cannot seem to call another 
> extension on a different location.  Nor can we transfer calls 
> between phones on different locations.  We can however call 
> extensions located in the same location and transfer calls in 
> the same location.
> 
> Are there specific ports needed for call transferring?

No
  I 
> know we have enabled ports 21, 8443, 12000, 5060, 5070 5080, 
> 30000-31000

Go though these instructions & troubleshooting tips:
http://wiki.sipfoundry.org/display/xecsuserV4r0/Remote+User+NAT+Traversal

What was the fix to the 18 seconds disconnect problem - the two problems could 
be loosely related.

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