[SIPForum-discussion] SIP Call to PSTN Networks

[Andrew Yu]

Hi James,

Almost all providers I know of require registration, this is for the 
registrar to update your location in its db, and perform AAA. If your 
provider require registration then you must or you will not be able to 
terminate your calls to the providers.

Andrew

Dimitris Makris wrote:
> Hey all,
>
> It is known that registration is NOT required to enable a user agent 
> to use a proxy server for outgoing calls. I need to know if this 
> feature applies only to SIP-to-SIP internet calls or in general. For 
> example if i want to call a PSTN/ISDN endpoint through my sip 
> provider, is it mandatory to register with him first?
>
> Thanks in advance.
> James Makris
>
>
>
>
>
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