What is direct SIP address calling

[VOIP_JoeSummy]

I have an account with VOIP.ms, and My OBI110 SP2 is connected to it.

Let's say, for the sake of this discussion, my SIP address is 111111@toronto.voip.ms. If another person uses a software softphone to call this SIP address, will the phone behind my OBI110 ring?

Does VOIP.ms provide this feature for free, or do I have to pay for it?

Can such feature reduce the need for a DID?

[drgeoff]

1. Not all ITSPs permit incoming SIP calls. Only calls to the DID will connect. There is a list at http://www.sipbroker.com/sipbroker/action/providerWhitePages. The green ticks and red crosses indicate which do and which do not.

2. It is also possible to SIP call an Obi directly even if not SIP registered to any ITSP.

[VOIP_JoeSummy]

Unfortunately, according to the sipbroker.com, all those well-known consumer-friendly VOIP service providers do not provide in-bound SIP calls ( like toronto.voip.ms, Aveno, Vonage, etc. ). A lot of small obscure little-known techie service providers make up that list instead. Why? Does supporting such feature adding a lot of stress to the servers for the mainstream service providers?

I do not like iNum. I think it adds an extra layer of translation to the process, thus creating one more weakest link to the chain. I prefer making a SIP call directly.


2. It is also possible to SIP call an Obi directly even if not SIP registered to any ITSP.

I guess you mean direct IP address dialing.  Then only the old Windows XP phone dialer application can do that. Right?

[drgeoff]

1. When a call comes in to a DID the ITSP is terminating a POTS call and receives money as a termination fee. An incoming SIP call earns the ITSP nothing.

2. Many ATAs including OBis can do direct IP address dialling. And it doesn't have to be a numeric IP address. You can give your router a URL, even if your ISP assigns it a dynamic IP address.

[azrobert]

The link drgeoff posted allows a landline to call via SIP. You call a SIPBroker access number then enter a code followed by an account number.

Here are the access numbers:
http://www.sipbroker.com/sipbroker/action/pstnNumbers

You can call VOIP.ms via SIP:
http://wiki.voip.ms/article/SIP_URI

The softphone you use must be able to call without registration. The softphones I know are CSipSimple for Android and Phonerlite for Windows. You can call your OBi directly with these softphones.