ZyXEL p-2802h-i1 Manual Do Utilizador

 Chapter 10 Voice

P-2802H(W)(L)-I Series User’s Guide

URL Type

Select whether or not to include the SIP service domain name when the ZyXEL 

Device sends the SIP number.
SIP - include the SIP service domain name.
TEL - do not include the SIP service domain name.

Expiration 

Duration

Enter the number of seconds your SIP account is registered with the SIP register 

server before it is deleted. The ZyXEL Device automatically tries to re-register 

your SIP account when one-half of this time has passed. (The SIP register server 

might have a different expiration.)

Register Re-send 

timer

Enter the number of seconds the ZyXEL Device waits before it tries again to 

register the SIP account, if the first try failed or if there is no response.

Session Expires

Enter the number of seconds the ZyXEL Device lets a SIP session remain idle 

(without traffic) before it automatically disconnects the session.

Min-SE

Enter the minimum number of seconds the ZyXEL Device lets a SIP session 

remain idle (without traffic) before it automatically disconnects the session. When 

two SIP devices start a SIP session, they must agree on an expiration time for idle  

sessions. This field is the shortest expiration time that the ZyXEL Device accepts.

RTP Port Range

Start Port
End Port

Enter the listening port number(s) for RTP traffic, if your VoIP service provider 

gave you this information. Otherwise, keep the default values.
To enter one port number, enter the port number in the Start Port and End Port 

fields.
To enter a range of ports,
•

enter the port number at the beginning of the range in the Start Port field.

•

enter the port number at the end of the range in the End Port field.

Voice 

Compression

Select the type of voice coder/decoder (codec) that you want the ZyXEL Device to 

use. G.711 provides higher voice quality but requires more bandwidth (64 kbps).
•

G.711A is typically used in Europe.

•

G.711u is typically used in North America and Japan.

G.726 operates at 16, 24, 32 or 40 kbps.
By contrast, G.729 only requires 8 kbps.
The ZyXEL Device must use the same codec as the peer. When two SIP devices 

start a SIP session, they must agree on a codec.

Primary 

Compression 

Type

Select the ZyXEL Device’s first choice for voice coder/decoder.

Secondary 

Compression 

Type

Select the ZyXEL Device’s second choice for voice coder/decoder. Select None if 

you only want the ZyXEL Device to accept the first choice.

Third 

Compression 

Type

Select the ZyXEL Device’s third choice for voice coder/decoder. Select None if 

you only want the ZyXEL Device to accept the first or second choice.

DTMF Mode

Control how the ZyXEL Device handles the tones that your telephone makes 

when you push its buttons. You should use the same mode your VoIP service 

provider uses.
RFC 2833 - send the DTMF tones in RTP packets.
PCM - send the DTMF tones in the voice data stream. This method works best 

when you are using a codec that does not use compression (like G.711). Codecs 

that use compression (like G.729 and G.726) can distort the tones.
SIP INFO - send the DTMF tones in SIP messages.

Outbound Proxy

Table 49   VoIP > SIP Settings > Advanced