Welltech VoIP ATA series V.2.1 - Manual (Page 89)

ATA-171/172/171P/171M/171+/172+
User’s Guide
G.711 & G.729 Default: 20 ms；G.711 & G.729 Packet Length .Provides 10ms，
20ms，30ms，40ms，50ms，60ms，70ms，80ms，90ms mode.
iLBC Default: 30 ms；iLBC Packet Length; provides 20ms and 30ms
mode.
Voice VAD Provide Voice VAD information.
Voice VAD Default: OFF. When setting ON, (Voice Active Detection. VAD)
will be active, provides ON and OFF mode.
Submit [Button] Submit the change.
Reset [Button] Clear the change.
7.3.3 Operate Instruction
Step 1: On the main page, select [SIP Settings  Code Settings], enter [Code Settings] page,
after revising the information (e.g.: Codec
Priority 1: G.729，Priority2: G.711a-law，
Priority 3: G.711ulaw，Priority 4: iLBC，Priority 5: G.726-16，Priority 6:
G.726-24，Priority 7: G.726 32，Priority 8: G.726 40，Priority 9:G.711 & G.279:
60ms，iLBC: 30ms，Voice VAD: on) (See Figure 1), click [Submit].
(Figure 1)
Step 2: After saving change, enter [Note Information] page, “Note Information” will be seen,
then the changing will come into effect.
Step 3: On the main page, select [Save Change] item, enter [Save Changes] page, and execute
the saving command by click [Save]. [Note Information] page will be seen which means
saving successfully. And the system will be restarted, please wait for a while.
Step 4: After rebooting, and call to equipment, the new Codec mode will be adopted.