User guide

VOIP INFORMATION 246
b) Click Settings. The Keep Alive Settings window appears.
c) Select the type of ping, as directed by your service provider. Choices are:
• Simple ping — A standard ping message that works with all SIP servers.
• Nortel ping — A longer but more reliable ping message that only works with specific
Nortel SIP servers (e.g. Nortel MCS 5200).
d) If necessary, change the ping frequency, as directed by your service provider. The default
setting is 45 seconds.
8. Enter the IP addresses or FQDNs, as provided by the service provider, into the following
boxes. If the service provider does not specify a value, leave the box blank.
•Proxy server name
•Registrar server name
• Outbound proxy
• Realm/domain
SETTING CODEC OPTIONS
If you are using a TalkSwitch-certified VoIP service provider, visit the support section at http://
global.talkswitch.com to access the service configuration guide for your VoIP service provider.
The service configuration guide lists the supported codecs.
A codec is a method of compressing and decompressing audio signals for communication across
a network. TalkSwitch supports the G.729, G.726 and G.711 (µ-law or A-law) codecs for VoIP
calls. If your service provider or equipment requires specific codecs for VoIP or Fax over IP calls,
you can restrict TalkSwitch to use the required codec.
The Codec Options window allows you to select the codecs your system can use, specify the
preferred codec, and clear the unsupported codecs. You can specify the codecs for the
TalkSwitch profile, and for each service provider profile. External IP extensions will use the
preferred codec specified in the TalkSwitch profile.
1. Select the VoIP Configuration page.
2. Click Codec Options. The Codec Options window appears.