Cisco VG30D, User Manual

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Cisco VG30D Voice Gateway User Guide
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Chapter 6 Conversions and Transparency
Configuring Cisco VG30D Voice Gateway Proxy Services
Limitations to Diversion Restriction
Diversion Restriction should not be used unless the following conditions are true:
•
The originating PBX refuses to implement certain kinds of diversion.
• You are certain that your QSIG PBXs can perform call forward by join.
Note Call forward by join can result in non-optimal bearer paths (trombones). Because of the particular way
in which the path is created, these may not always get optimised by subsequent path replacement
requests.
Configuring Diversion Restriction
Changes in diversion behaviour take place by using the Cisco VG30D Voice Gateway
Configuration / Q.931 Services window. Set Reject Diversion Requests for Numbers longer than to
the maximum length of the number that is permitted, or set to 0 to disable diversion restriction.
Configuring Cisco VG30D Voice Gateway Proxy Services
For most applications the Cisco VG30D Voice Gateway Application windows give adequate control over
the services to be proxied by the Cisco VG30D Voice Gateway on behalf of Q.931 equipment, but some
more detailed tuning is possible using the
Configuration / DPNSS Advanced window.
Proxy Diversion Address Filtering
In particular, you can set an address filter to determine whether the Cisco VG30D Voice Gateway will
attempt to make a proxy diversion or will reject the call immediately.
The filter operates by comparing the leading digits of the diverted-to number with a pre-set number. You
can configure the Cisco VG30D Voice Gateway to attempt proxy diversion if the diverted-to address
digits meet any of the following criteria:
• Match the preset digits up to the length of the pre-set, but the diverted-to address may be longer than
the pre-set (if your network numbering plan uses a node numbering strategy, this allows you to
confine proxy diversions to a single node or group of nodes. For example you can confine the
diversions to occur within the DPNSS network only);
•
Fail to match the preset digit string, up to the length of that string (This is the inverse of the previous
option. If your network numbering plan uses a node numbering strategy, it allows you to perform
proxy diversions except to a single node or group of nodes. For example this option allows you to
exclude diversions to the Q.931 equipment);
•
Match the preset exactly, including having the same number of digits as the preset (This allows you
to permit only one proxy diversion address. For example, this option allows you to permit configure
the address of a voice mail system.);
• Are any value (That is, the Cisco VG30D Voice Gateway will attempt to proxy all diversion
requests).
The address filter gets set from the Configuration/DPNSS Advanced window.