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Configuring Gateway Settings
114
SCOPIA 400/1000 Gateway User Guide
Table 3-13
Advanced Settings—ISDN (or Serial) to IP Calls
Field or Check Box
Conceal caller ID
(unavailable in
Gateway S40 SP)
Enable T.120 capabilities
in incoming IVR and
TCS4 calls
Support sub-address at
Call Setup (unavailable in
Gateway S40 SP)
Description
Select to have the Gateway hide the identifier of the calling
endpoint on the ISDN network, regardless of whether or not
the Support Presentation Restriction advanced setting is
selected. The callerID field of the Q.931 message is sent
over the IP network containing the string "0000."
Select to enable the Gateway to send T.120 capabilities
messages to the ISDN endpoint upon receiving a call at the
IVR-internal or TCS4 stage. The Gateway sends the T.120
messages before connecting to the IP network endpoint.
Sub-addressing is a one-stage Direct Inward Dialing (DID)
dialing mechanism in which a phone sends two numbers.
One number is for routing on the circuit switched network.
The other number is forwarded to the Gateway inside a
Q.931 sub-addressing information element for IP address
resolution by the gatekeeper.
Sub-addressing can also be used for implementing ISDN
fallback when not enough bandwidth is available for routing
an IP-oriented call over IP.
Select for the Gateway to take the E.164 number from the
Q.931information element sub-address field and forward it
to the gatekeeper for address resolution. Sub-addressing
requires gatekeeper support.
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