I have 2 freepbx connected each other by sip with this settings
PEER:
host=192.168.4.25
type=friend
context=from-internal
nat=no
qualify=yes
canreinvite=no
insecure=very
dtmfmode=auto
disallow=all
allow=alaw&ulaw&g729
USER:
host=192.168.4.25
type=friend
context=from-internal
1 FreePbx have ext 2XX
2 freepbx have ext 4XX
So the subscriber 400 worth forwarding on no answer after 15 seconds on a city cell phone format 279XXXX, ozhnako on the first ring when forwarding fails first, whether as to redirect to mobile phone format 8928XXXXXXX the call forwarding works fine!
when SIP 202 cal to SIP 400 wait 15 sec nobody answer, start work call forwarding and after busy.
but if 402 call to 400 wait 15 sec nobody answer, start work call forwarding and call forward to 279XXXX (and i connect with cell phone)
it became after i install module Extension routes
Before it’s work fine to all routes…
sorry for my english!