Brian <a...@cityscape.co.uk> wrote: > However, sip...@sipgate.co.uk works for phones registered with the > network (just like Skype). There is no connection established when the > call is from another network (again, just like Skype).
This restriction was put in place by Sipgate to stop VoIP SPAM. There's no reason why you couldn't register your phone number and direct IP address with an organisation such as E164 (e164.org) for others to use. However, unlike Skype, the protocol neither requires you to do this nor use a broker/proxy such as Sipgate. I used to have my VoIP phone accessible by IP address. No-one I know calls me directly like that, and thanks to frequent probing by Sip Vicious I've abandoned that solution and just remained registered with Sipgate. Sipgate interoperates with a number of other commercial SIP providers. But since it doesn't use any of the enum services you have to route the call manually. I believe this non-transparent interoperability is a fairly standard situation. > It is some time since I last looked into this but I think the Betamax > VoIP products also do the same; communication using SIP between users on > the same network but none from outside. Actually, they may not even > allow their own registered phones to contact other SIP phones on a > different network. SIP phones don't (need to) register with Betamax providers - essentially these particular services are outbound only. Chris -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/22nc5axs2h....@news.roaima.co.uk
