I've just set up a Polycom IP320 with voiptalk.org. I can receive calls and I can dial out to my mobile, but if I try to dial a land line, before I've finished the dialing code, I get the message that I'm dialing an unrecognized number. Anyone got any ideas?

Thanks,

Danny

Update: It only does it on speaker phone or with the handset off the hook. If I dial with it in place it's fine!