Welltech ePBX-100A-128 - Manual (Page 33)

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Note:
• Now ePBX-100A-128 could not support G729 with Inband Keypad type. If
ePBX-100A-128 detect the caller or callee not support RFC2833 DTMF type.
Then ePBX-100A will force the Codec to G711 to make sure the DTMF detection
is correctly .
„ NAT Traversal: If the Extension device is behind a device performing NAT, such as
firewall or router, and need to register to ePBX-100A-128 on public network, then user
has to enable this function. Enable NAT Traversal to force ePBX-100A-128 to ignore
the contact information for the Extension and use the address from which the packets
are being received.
„ RTP Mode: User can choose for two type of RTP mode, one is Routed Mode another
is Direct Mode. The voice media will be routed “Peer-to-Peer” if two clients are both
setting to Direct Mode. This way will improve the voice quality and reduce the
performance wastage of the ePBX-100A-128.
Note:
•
If one peer set to Direct Mode but another peer set to Routed Mode, the result will
become to Routed Mode.
•
Voice media will still go through the ePBX-100A-128 if the ePBX-100A-128 needs
to detect DTMF.
•
If you enable the NAT Traversal function for Extension, the RTP mode will change
to Routed Mode directly; this way will avoid the “one-way voice” or “no voice
issue” of VoIP.
• If the both peers are under different subnet, or one peer is under Public IP but
another one is under Private IP, we strongly suggest you to set the RTP mode
to Routed Mode to avoid some unexpected voice problems.
„ Fixed Trunk ID: User can define a Fixed Trunk for a certain extension. When such
extension makes an outgoing call via routing table, ePBX-100A-128 will check “Fixed
Outgoing Call Rule” first. If “Fixed Outgoing Call Rule” is enabled, then
ePBX-100A-128 will confirm the Fix Trunk ID for the calling party. That means the
outbound call will be routed by Fixed Trunk ID, if you define the Fixed Trunk ID for the
calling party and you also enable “Fixed Outgoing Call Rule”.
Note:
•
For more information about Fixed Outgoing Call Rule, please refer to the user
manual: CH3.1.6.1 Outgoing Call Rule.
„ Absolute Timeout: Specific the timeout value for the outgoing calls. Please also go
to Outgoing Call Rule page to enable the Route Timeout function.
„ BLF: Enable BLF function for extensions.