6-3
Cisco VG30D Voice Gateway User Guide
OL-19276-01
Chapter 6 Conversions and Transparency
Q.931/DPNSS Conversion Configuration
DPNSS Port 2 Configuration
Basic Configuration
The default setting of Level 2 for the DPNSS port specifies
A
end. Ensure that this is configured with
inverse orientation to the attached equipment/network.
Sub-Configured Links
You can configure DPNSS channels individually for operational service (that is, the DPNSS link can be
sub-configured). Q.931 calls will only get generated or accepted on those channels for which an
equivalent DPNSS channel is configured.
Contention (Glare) Resolution
When all channels on the associated DPNSS link are configured as
X
, the DPNSS equipment, being the
Y
end, gives precedence to incoming calls, so most channel contention problems get resolved in the
DPNSS network.
Similarly, it is advantageous though not mandatory, if Cisco VG30D Voice Gateway can be configured
as the “Network” end of the Q.931 link. This is because this gives it precedence for calls over the
attached “User” end equipment.
Reduce channel contention (glare) problems further by influencing the choice of alternative channel.
Select
High to Low
or
Low to High
as the
Channel Allocation
option, when you are configuring the
DPNSS stack.
High to Low
causes the highest free channel to be selected, and
Low to High
causes the
lowest free channel to be selected.
Services Configuration
Default Private Network Number
When you are operating into a Q.931-based public network, which may address calls to the subscriber
number only, with no private network extension number, you must ensure that a private network
extension number is supplied, so that non-DDI calls get directed to a sensible destination such as the
common operator. Normally, this would be done in the DPNSS PBX, but you can configure it to be
supplied by the converter.
By default, non-DDI calls are receive a DPNSS Called Line Identity of
0
, as the ubiquitous operator
number. You can customize this forwarding address by configuring the appropriate private network
number, including any node address, as the
Default Destination Address
.
You do not need the Default Private Network Number for transparency.
Destination Address Editing
You can edit the destination address that is associated with calls from DPNSS before the address passes
out to Q.931, by discarding up to three leading digits. For example, a leading 9 inserted to cause the call
to be routed to an outgoing public trunk can get stripped before the call passes to the ISDN by setting
Number of Destination Digits to Strip
to
1
.
No requirement exists for Address Editing when you are using transparency.
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