ZyXEL Communications P-2302R-P1 - Manual (Page 73)

P2302R-P1 Support Notes
All contents Copyright

2007 ZyXEL Communications Corporation.
73
Duration 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 conversation can last before the call is
automatically disconnected. Usually, when one-half of this time has passed,
the ZyXEL Device or the other party updates this timer to prevent this from
happening.
Min-SE
Enter the minimum number of seconds the ZyXEL 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 ZyXEL Device rejects it.
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.
In 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.