Operation Manual

COMfortel 1400IP/2600IP/3600IP - Firmware V2.2G - Operation and Configuration V03 07/2015 475
Settings
Providers and PBXs
Configuring Codecs
3. Under NAT, tap on NAT.
4. Select or clear the NAT keep alive check box.
5. Tap on NAT keep alive interval (s) and then enter a value in the entry field. Possible
entries:
Note: Some providers lock accounts if the NAT keep alive interval is too
short. As a rule, this is reported with error message 503 during SIP regis-
tration. If this problem occurs, we recommend you reduce the value (e.g. to
180).
6. Tap on OK.
Configuring Codecs
The G.722, G.711 and iLBC codecs can be used to transfer data. The selection of a codec
affects the quality of a VoIP call. Depending on the bandwidth of the connection, you can
specify a codec to give the best possible VoIP call quality (high band width) or a codec to give
the best possible compression rate (low bandwidth).
Which codec is actually used to handle a call is defined in your negotiations with the provider.
Notes:
If using a codec with high bandwidth (e.g. G.711) produces too much inter-
ference in the call quality, it is possible that the connection bandwidth is not
sufficient. If these types of disruptions happen frequently, we recommend
you select codecs with a lower band width.
Not every codec is supported by every provider.
You can configure codecs as follows:
• Separately for the provider or PBX
• Using the configuration manager
• Using the telephone
Enables NAT Keep Alive.
Disables NAT Keep Alive. (No further action is required.)
1 to 255: NAT Keep Alive packets are sent every 1 to 255 seconds.