User`s manual

VoIP/(802.11g) ADSL2+ (VPN) Firewall Router
Chapter 4: Configuration
113
Codec Preference
Codec is short for Coder-Decoder used for data signal conversion. The order of preference for Codec
usage is set here Note that some VSPs require that certain Codecs are available for use eg G.729
G.729: Used to encode and decode voice information into a single packet which reduces the bandwidth
consumption.
G.711µ-LAW: A basic non-compressed encoder and decoder technique. µ-LAW uses pulse code
modulation (PCM) encoder and decoder to convert 14-bit linear sample.
G.711A-LAW:
A basic non-compressed encoder and decoder technique. A-LAW uses pulse code
modulation (PCM) encoder and decoder to convert 13-bit linear sample.
G.723: Used to encode and decode voice information into a single packet which reduces the bandwidth
consumption.
G.726-32: Used to encode and decode voice information into a single packet which reduces the
bandwidth consumption. Currently only supports bit rate of 32Kbps.
Non-used: Only available in Priority fields 2, 3 and 4. It is selected if codec is not to be used.
DTMF Method: The Inband, RFC 2833 and SIP INFO (RFC 2976) standards are supported.
Speed Dial
Speed Dial may be used to store frequently used telephone numbers which you can access by pressing a
single phone button from 0 to 9, followed by the pound sign (#).
For example, to speed dial to a phone number stored on 9, just press keypad 9 then #. Your router will
automatically call out to the number listed on entry 9.
You can also use this function to store SIP URLs to make SIP to SIP calls.
Examples:
If your friend Tim gives you a SIP URL as sip: 89755@192.246.69.223 then you can fill in the Speed Dial
as 89755@192.246.69.223.
If your friend Felix gives you a SIP URL as sip: [e-mail] then you can fill in as [e-mail].
If your friend Greg gives you an IP address "192.246.56.56" only, then you can fill in as “192.246.56.56”.
If the destination Router is set up for DDNS, you can use the domain name in the Speed Dial field.
Volume Control
Volume control helps you to adjust the sound level of the telephone to the best comfortable listening level.
Echo problems can be caused by having the levels set too high.
Press “-“, the minus sign, to reduce either microphone or/both speaker’s level of your telephone.
Press “+“, the plus sign, to increase either microphone or/both speaker’s level of your telephone.