SIP TRUNK concept - DOD

[siki85]

Hi mates,

My doubt is a misunderstanding of what is really SIP TRUNK for IP PBX.

Let say, a Service Provider offer to you a SIP TRUNK with 100 numbers. So, the Service Provider gives you the data necessary in order to have the SIP TRUNK operational, data like:
- SIP DOMAIN
- Username: 89777700
- Password
- SIP Proxy IP

It turns out that you are able to turn up your SIP TRUNK with the data above, data that would usually correspond to the pilot number 89777700. My issue is, when you try to make a call from a number that is considered to be inside the trunk ( for example, 89777705) this call is rejected with a 403 Forbidden. My question, is it necessary to send a REGISTER message for that 89777705 previously ?

I think that 'SIP TRUNK' is a service where you REGISTER a service with just one account (pilot number), and this service will let you make calls from a range of numbers associated with that SIP TRUNK in the Service Provider site.

Please, correct me if I'm wrong...

CCNA, SECURITY+

 

[amriddle01]

You're correct, however the way a trunk works can vary greatly depending on provider, not all use registration but when they do it's just a single name/password

 

[siki85]

Thanks my friend.

Regards,

CCNA, SECURITY+