I am using a Obi 110 and wish to forward my PSTN number to my SIPgate or Obitalk number onto my mobile.
I can call forward my PSTN number OK to my sipgate uk number my mobile rings ok but when I pick on the mobile to ring and when I answer the call get no audio.
Please explain how your Sipgate number is ringing your mobile phone. AFAIK Sipgate UK do not issue mobile (07) numbers as DIDs.
I have also tried to to forward my PSTN number to my obitalk number but get an automated 'no service config error' voice.
That error message is most likely from your OBi110. The call isn't even leaving it. What exactly do you mean by "my obitalk number"? The OBiTALK number of your 110 or the OBiTALK number of another OBi device or the OBiTALK number that was allocated to you (when you registered your 110) for use with eg OBiON?