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Step.11 - In the same SIP settings menu
> SIP KEEP ALIVE
>
Key in the SIP KEEP ALIVE time for eg:- 20Seconds
and choose
ENABLE
and select it.
Note: This is to overcome the NAT barrier so that the phone is
contactable by a previously contacted external party.
Step.12 - Return to SIP SETTINGS menu
> AUDIO CODEC >
for eg:-
choose G711-A and select it.
Step.13 – After the configuration, select
> ACTIVATE
.
Note: This is a program capable of performing encoding
and decoding a voice package.
Note:
STUN = Simple Transversal of UDP (User Datagram Protocol)
through NATs (Network Address Translators).
TIP: Enter either the IP address of your SIP server or the URL domain name as given to you by your
Internet Telephony Service Provider.
Fig.48 Audio Codec Screen
48