Talkswitch 24-CA - Manual (Page 179)

V O I P I N F O R M A T I O N 1 6 7
Maximum number of VoIP lines for outgoing calls:
The maximum number of VoIP numbers available is determined by how
many lines are available (shared) with the TalkSwitch VoIP network. For
business reasons, you might want make all lines available for incoming
calls and restrict outgoing calls so that no incoming calls are getting
missed. It is recommended that at least one line be allocated for outgoing
calls.
Codec Options (button)
A codec is a method of compressing and decompressing audio signals for
communication across digital networks. TalkSwitch supports 3 standardized
VoIP codecs:
• G.729 (default — low bandwidth)
• G.726 (better voice quality — medium bandwidth)
• G.711 (best voice quality — high bandwidth)
One of these codecs must be selected as the Preferred Codec. By default
G.729 is used to accommodate the maximum number of concurrent calls.
Voice Activity Detection (VAD) analyzes an audio stream to detect the
presence or absence of speech and distinguishes speech from background
noise. VAD can be used to reduce voice bandwidth when no speech is
detected and reduce unwanted noise transmission.
Figure 130: Codec
View Registrar Entries (button)
If this location is the designated SIP server (proxy/registrar), click this
button to view which systems are registered with the SIP server. A window
opens listing all TalkSwitch systems and gateways registered with this
system. Client is the phone number assigned to a VoIP line. Contact is the
information used by the SIP server to contact the client. It is comprised of
the phone number, public IP address and part number. Expires is the amount
of time, in seconds, that the client is registered with the SIP server before
having to re-register.