ZyXEL Communications P-2302RL-P1 Support Notes page 74

Primary
CompressionType Select the ZyXEL Device's first choice for voice coder/decoder.
Secondary
Compression
Type
Third
Compression
Type
DTMF Mode
STUN
Active
Server Address
Server Port
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.
This field is disabled if Secondary Compression Type is None.
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.
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) can distort the tones.SIP
INFO - send the DTMF tones in SIP messages
Select this if all of the following conditions are satisfied.
There is a NAT router between the ZyXEL Device and the SIP server
The NAT router is not a SIP ALG.
Your VoIP service provider gave you an IP address or domain name for a
STUN server. Otherwise, clear this field.
Enter the IP address or domain name of the STUN server provided by your
VoIP service provider.
Enter the STUN server's listening port, if your VoIP service provider gave
All contents Copyright  2007 ZyXEL Communications Corporation.
P2302RL-P1 Support Notes
74