User guide

Forbid outgoing
ISDN calls
When enabled, this option allows only ISDN
to IP calls to be made through the ISDN
gateway.
Use this feature if you wish to prevent
potentially costly outgoing ISDN calls being
placed.
Advanced settings
Field Field Description Usage Tips
Audio codecs
allowed
Restricts the choice of audio codecs that
endpoints calling through the ISDN gateway
may select.
IP and ISDN endpoints between themselves
negotiate which audio codecs to use during a
call. Use these options if you wish to restrict
the choices available.
Prohibiting audio codecs may prevent
endpoints negotiating a compatible codec;
use these options only if you experience a
particular problem when using a certain
codec with the ISDN gateway. If the IP
endpoint is in fact a Codian MCU or IP VCR,
consider disabling the codec on that device
instead.
Video codecs
allowed
Restricts the choice of video codecs that
endpoints calling through the ISDN gateway
may select.
IP and ISDN endpoints between themselves
negotiate which video codecs to use during a
call. Use these options if you wish to restrict
the choices available.
Prohibiting video codecs may prevent
endpoints negotiating a compatible codec;
use these options only if you experience a
particular problem when using a certain
codec with the ISDN gateway. If the IP
endpoint is in fact a Codian MCU or IP VCR,
consider disabling the codec on that device
instead.
Note that H.263 also encompasses H.263+.
H.239 video codecs
allowed
Restricts the choice of H.239 codecs that
endpoints calling through the ISDN gateway
may select. H.239 allows a separate
presentation stream alongside the video
stream.
IP and ISDN endpoints between themselves
negotiate which H.239 codecs to use during
a call. Use these options if you wish to
restrict the choices available.
Prohibiting H.239 codecs may prevent
endpoints negotiating a compatible codec;
use these options only if you experience a
particular problem when using a certain
codec with the ISDN gateway. If the IP
endpoint is in fact a Codian MCU or IP VCR,
consider disabling the codec on that device
instead.
Related Topics
● Configuring ISDN Ports Settings
● Shutting Down the ISDN gateway
Codian ISDN GW 3200 Series User Guide Version 1.0(1.18)
Copyright (c) Codian Limited, 2006 Page 36 of 50