I haven't used one of these devices but looking on the web the following should work fine.
Firstly go into the main configuration menu
Phone Number: <your italk no ie 649974xxxx>
Display Number: <your italk no ie 649974xxxx>
Auth ID: <your italk no ie 649974xxxx>
Auth Password: <your italk password>
Confirm Password: <your italk password>
Proxy/Register: akl.italk.co.nz
Codec: ulaw
note g729 may offer better voice quality over lower speed connections. ulaw uses just over 90kbps in each direction (180kbps total for a call) g.729 uses around 30kbps in each direction
DTMF: rfc2833
Payload Type: 101
Use proxy : Yes
Port No: 5060
There is also a QoS setting in this router which you can set to your maximum upload speed but this only works if you are are using the v300 as a router (ie plugged straight into a modem). If the v300 is downstream from another router then it will make no difference. If you have a router that supports QoS I highly recommend enabling this.
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