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Chapter 18 Outbound Line Group
X6004 User’s Guide
173
DTMF Mode Control how the X6004 handles the tones that the IP phones on your network
make when they push their buttons. One use of the tones is to distinguish between
numbers when trying to dial a PSTN phone number. You should use the same
mode as your trusted peer. The choices are:
• rfc2833 - Follow the RFC 2833 standard and send the DTMF tones in RTP
packets.
• inband - Send the DTMF tones in the voice data stream. This works best
when you are using a codec that does not use compression (like G.711).
Codecs that use compression (like G.729) can distort the tones.
• info - Send the DTMF tones in SIP messages.
Codec Setting
Select the type of voice coder/decoder (codec) that you want to use when
communicating with the trusted peer. See Section 14.1.1 on page 126 for more
information on voice codecs. The following codecs (shown in highest quality to
lowest quality order) are supported by the X6004:
•G.711A (typically used in Europe)
• G.711µ (typically used in North America and Japan)
• G.729A
• G.723.1 - you must activate support for this codec in the Configuration > PBX
> Server Configuration > SIP Server screen.
•G.726
When two SIP devices start a SIP session, they must agree on a codec.
If the trusted peer uses videophones, you must specify the video codecs used for
video calls. The X6004 allows the following video codecs to passthrough:
•H.261
• H.263
• H.264
See Section 14.1.2 on page 127 for more information on video codecs.
Codec Pool
This column indicates the codec types not used for this trusted peer connection.
You can add a codec type to be used for these extensions by highlighting it and
hitting the Right button.
Codec List
This column indicates the codec types used for this trusted peer connection. You
can organize the priority of the codecs by highlighting it and clicking the Up or
Down buttons to move the codec higher or lower in priority. The SIP extensions
attempt to use the higher priority codecs first and try the lower priority codecs next.
You can remove a codec type from being used from these extension by
highlighting it and hitting the Left button.
Apply
Click this to save your changes and to apply them to the X6004.
Cancel Click this to set every field in this screen to its last-saved value.
Table 71 Trusted Peer Configuration
LABEL DESCRIPTION