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Using the Cisco TelePresence ISDN Gateway for voice-only calls
Cisco TelePresence ISDN Gateway 2.1 Online help (Printable format) 13 of 135
Using the Cisco TelePresence ISDN Gateway for
voice-only calls
The Cisco TelePresence ISDN Gateway can be used to forward voice-only IP calls to the ISDN network
(the PSTN); likewise, it can be used to forward voice-only ISDN calls from the PSTN to IP telephones on
the IP network. If you want to use the ISDN Gateway to forward voice-only calls, there are two ways to
configure this feature:
globally: either
o entirely as a voice-only gateway: where all IP calls and all ISDN calls are forwarded as
voice-only calls, or
o partly as a voice-only gateway: where incoming ISDN video-conferencing calls are
allowed, but outgoing ISDN calls are voice only (or vice versa)
dial plan configuration: where particular calls (ingoing and outgoing) are allowed to be video
conferencing calls, and where particular calls are restricted to voice-only
IP to ISDN calls: IP endpoints often do not allow the caller to specify the type of call being made. For
example, a caller may want to make a telephone call (that is, voice only), but are unable to specify that
this is a telephone call. To overcome this problem, for IP data calls, if required, the ISDN Gateway can
extract the voice part of the call and forward it to the ISDN network as a voice-only call. For IP to ISDN
calls, if the ISDN Gateway receives a video conferencing call that has been restricted to being a voice-
only call (due to the settings on the ISDN Gateway), the unit will forward it as a voice-only call (the call will
not be dropped). If the IP endpoint does allow the call type to be specified, an IP telephone call will
always be placed as such.
ISDN to IP calls: ISDN endpoints usually allow a caller to specify the type of call being made. This is
important, because with ISDN calls the voice part of the call cannot be separated from the video part.
Therefore, if the ISDN Gateway receives a video-conferencing call and the dial plan restricts the ISDN
Gateway to voice-only calls, the unit will drop the call. Voice-only telephone calls will always be accepted
by the ISDN Gateway.
Configuring the Cisco TelePresence ISDN Gateway as a voice-
only gateway
1. Go to Settings > ISDN.
a. To configure the ISDN Gateway to restrict incoming ISDN calls to voice-only calls, set the
Max incoming ISDN call rate to Telephone.
b. To configure the ISDN Gateway to restrict outgoing ISDN calls to voice-only calls, set the
Max outgoing ISDN call rate to Telephone.
2. Complete the other ISDN settings as per your requirements. For more information about the
ISDN settings page, refer to
Configuring general ISDN Settings.
Note: You can set both the incoming and outgoing maximum call rates to Telephone to use the ISDN
Gateway entirely as a voice-only gateway.