Wait a minute I might be onto something here. I have just checked the Event Log in the 7402 and this is appearing...
(this is the SIPme phone port 2)
June 29 09:03:58 home.gateway:voip:none
hone 2 (1777xxxxxx) Codec Algorithm: G729
...but it is NOT showing up for phone 1 which is the Voxalot VSP.
I know that is the problem but how do I fix it?