Specifications

Setting Up Call Handling
How to Set Up Call Handling for Incoming and Outgoing Calls
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Cisco Unified Survivable Remote Site Telephony Version 4.0 System Administrator Guide
You can have up to 20 COR lists for each incoming and outgoing call. A default COR is assigned to
directory numbers that do not match any COR list numbers or number ranges. An assigned COR is
invoked for the dial peers and created for each directory number automatically during CallManager
fallback registration.
If a COR is applied on an incoming dial peer (for incoming calls) and it is a superset of or is equal to the
COR applied to the outgoing dial peer (for outgoing calls), the call will go through. Voice ports
determine whether a call is considered incoming or outgoing. If you hook up a phone to an FXS port on
a Cisco Unified SRST router and try to make a call from that phone, the call will be considered an
incoming call to the router and voice port. If you make a call to the FXS phone, the call will be
considered outgoing.
By default, an incoming call leg has the highest COR priority; the outgoing call leg has the lowest
priority. If there is no COR configuration for incoming calls on a dial peer, you can make a call from a
phone attached to the dial peer, so that the call will go out of any dial peer regardless of the COR
configuration on that dial peer. Table 6 describes call functionality based on how your COR lists are
configured.
SUMMARY STEPS
1. call-manager-fallback
Table 6 Combinations of COR List and Results
COR List on Incoming
Dial Peer
COR List on Outgoing
Dial Peer Result
No COR No COR Call will succeed.
No COR COR list applied for
outgoing calls
Call will succeed. By default, the incoming dial peer
has the highest COR priority when no COR is applied.
If you apply no COR for an incoming call leg to a dial
peer, the dial peer can make a call out of any other dial
peer regardless of the COR configuration on the
outgoing dial peer.
COR list applied for
incoming calls
No COR Call will succeed. By default, the outgoing dial peer
has the lowest priority. Because there are some COR
configurations for incoming calls on the incoming or
originating dial peer, it is a superset of the outgoing
call’s COR configuration for the outgoing or
terminating dial peer.
COR list applied for
incoming calls
(superset of COR list
applied for outgoing
calls on the outgoing
dial peer)
COR list applied for
outgoing calls
(subsets of COR list
applied for incoming
calls on the incoming
dial peer)
Call will succeed. The COR list for incoming calls on
the incoming dial peer is a superset of the COR list for
outgoing calls on the outgoing dial peer.
COR list applied for
incoming calls
(subset of COR list
applied for outgoing
calls on the outgoing
dial peer)
COR list applied for
outgoing calls
(supersets of COR list
applied for incoming
calls on the incoming
dial peer)
Call will not succeed. The COR list for incoming calls
on the incoming dial peer is not a superset of the COR
list for outgoing calls on the outgoing dial peer.