ZyXEL Communications MAX-306 User Manual page 154

Chapter 12 The Service Configuration Screens
Table 57 VOICE > Service Configuration > SIP Settings > Advanced (continued)
LABEL
Expiration
Duration
Register Re-
send timer
Session Expires
Min-SE
RTP Port Range
Start Port
End Port
Voice Compression
Primary,
Secondary, and
Third
Compression
DTMF Mode
STUN
154
DESCRIPTION
Enter the number of seconds your SIP account is registered with the
SIP register server before it is deleted. The WiMAX 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.)
Enter the number of seconds the WiMAX Device waits before it tries
again to register the SIP account, if the first try failed or if there is no
response.
Enter the number of seconds the conversation can last before the call is
automatically disconnected. Usually, when one-half of this time has
passed, the WiMAX Device or the other party updates this timer to
prevent this from happening.
Enter the minimum number of seconds the WiMAX Device accepts for a
session expiration time when it receives a request to start a SIP
session. If the request has a shorter time, the WiMAX Device rejects it.
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:
• Type the port number at the beginning of the range in the Start
Port field
• Type the port number at the end of the range in the End Port field.
Select the type of voice coder/decoder (codec) that you want the
WiMAX Device to use.
G.711 provides high 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.723 provides good voice quality, and requires 20 or 40 kbps.
• G.729 requires only 8 kbps.
The WiMAX Device must use the same codec as the peer. When two SIP
devices start a SIP session, they must agree on a codec.
For more on voice compression, see
Control how the WiMAX 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)
can distort the tones.
• SIP INFO - send the DTMF tones in SIP messages
Voice Coding on page 152
User's Guide