ZyXEL Communications X6004 User Manual

 Chapter 18 Outbound Line Group

X6004 User’s Guide

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 VoIP service provider. 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.

Caller ID

Select this if you want to send identification when you make VoIP phone calls. 

Clear this if you do not want to send identification.

Authentication

Username 

Type the SIP user name associated with this extension. The IP phone registering 

with the X6004 must provide this for authentication.

Password

Type the SIP password associated with this extension. The IP phone registering 

with the X6004 must provide this for authentication.

Codec Setting

Select the type of voice coder/decoder (codec) that you want this extension to use 

when communicating with the X6004. See 

 for more 

information on voice codecs. The following codecs (shown in highest quality to 

lowest quality order) are supported by the X6004:
•

G.711 a-law (typically used in Europe)

G.711 µ-law (typically used in North America and Japan)

G.723.1 - you must activate support for this codec in the Configuration > PBX 

> Server Configuration > SIP Server screen.

When two SIP devices start a SIP session, they must agree on a codec.
If these SIP extensions are assigned to videophones, you must specify the video 

codecs used for video calls. The X6004 allows the following video codecs to 

passthrough:
•

See 

 for more information on video codecs.

Codec Pool

This column indicates the codec types not used for these extensions. You can add 

a codec type to be used for these extensions by highlighting it and clicking the 

Right button. 

Codec List

This column indicates the codec types used by these extensions. 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 clicking the Left button. 

Apply

Click this to save your changes.

Cancel

Click this to set every field in this screen to its last-saved value.

Table 67   Configure a SIP Trunk