User guide

Fundamentals 113
Voice over IP (VoIP)
Transparent codec interconnection
Transparent codec interconnection allows SIP terminals to use
addition codecs even though the desired codec is not, or not
directly supported by the Forum 523/524 communications sys-
tem. Some examples are:
z G.722 audio codec for HQ audio
z H.264 video codec for transmitting images
Transparent codec interconnection is supported for internal SIP
subscribers and in the context of TC system networking with SIP
tie line connections.
You have to create a special VoIP profile for completely unfiltered
(transparent) codec negotiation:
1. Open the Telephony: Extended: VoIP profile page in the
configurator of the Forum 523/524 communications system.
2. Click on the New button to create a new VoIP profile.
3. Activate the All codecs option. Enter a designation into the
Profile name input field. Use Apply to confirm.
Allocate this VoIP profile to the desired SIP terminal or to the
desired SIP tie line. Please note that bandwidth cannot be
restricted for terminals or lines with this VoIP profile. This is suita-
ble, e.g. for SIP terminals operating on a LAN.
Codec interconnection with bandwidth restriction
You can implement bandwidth restriction with additional VoIP pro-
files using an extended codec list. The extended codec list con-
tains definitions for codecs which are used by the usual SIP termi-
nals. The codecs on this list are for usage in VoIP profiles and are
not directly supported by the Forum 523/524 communications
system.
You can load the extended list of codecs as a description file in the
Configurator of the Forum 523/524 communications system on
the System: Components page. The extended codec list is also
a part of data back-up.
Note: You can obtain the extended codec list as a description file-
from your Belgacom agent. This file should not be edited which is
why editing is not supported.