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Conversions and Transparency
Using the Q.931 interfaces, Cisco’s protocol support has some Q.932 Supplementary
Service extensions that can be used to advantage in interworking to DPNSS. When
used in conjunction with InterChange iQ 2000plus proxy interworking, this provides CCM
with significantly enhanced call capabilities. The table below complements that for Proxy
Interworking in the previous section, and shows the extra services that are available when
CCM is connected in this way:
DPNSS
Q.931
Text (Name)
Calling Party Name
Diversion to DPNSS Voice Mail
From IP ’phone
Message Waiting
(1)
- Call Back Messaging
- Manufacturer proprietary signalling
Indications from a DPNSS VMS IP ’phones
(Message Waiting Light ON/OFF)
Note:
(1)
There is no explicit message Waiting Indication Service in DPNSS. InterChange iQ 2000
systems support mappings to the standard DPNSS Call Back Messaging service, as used by
Mitel and some Philips PBXs, and to proprietary signalling used by Ericsson, and Siemens
(also Nortel) PBXs. Alternative proprietary signalling extensions can be configured as
necessary.
CCM’s QSIG service support is evolving and is expected eventually to reach the level at
which the most appropriate interworking is provided by an InterChange iQ 2000 system
configured for full interworking, as described in section
5.3
above.