[Asterisk-Users] Anyone knows how to receive a SIP call withoutregistering gateway?

[Enzo Michelangeli]

Well, a SIP authorization does not require a registration (in fact, registration should be primarily used to inform a registrar about the whereabouts of a UA with dynamic IP address in order to handle incoming calls _for_ that UA). 

CS can just create for his Asterisk a "type=user" entry in sip.conf containing "username" (equal to the section's title) and "secret" both matching the remote peer's own: his Asterisk will then react to an INVITE from that peer with a "401" reply containing a nonce as challenge; the peer will then retry the INVITE with valid credentials based on the shared secret and the nonce. 

Enzo
  
  ----- Original Message ----- 
  From: BJ Weschke 
  To: C. Savinovich ; Asterisk Users Mailing List - Non-Commercial Discussion 
  Sent: Wednesday, September 14, 2005 2:49 PM
  Subject: Re: [Asterisk-Users] Anyone knows how to receive a SIP call withoutregistering gateway?


   What they're asking you to do is quite insecure to be doing over public IP. At the very least, you should confirm that there is a static IP that these calls will be coming from and only accept calls from that IP, but that's still not quite as secure as digest authentication that would be available via registration. 

   If you know what IP the calls are coming from, you simply insert a host=XX.XX.XX.XX instead of host=dynamic in your sip.conf for that peer and calls should then come in as they did before without them having to register. If they are pre-pending digits on to the front of what you're interpreting as the dialed number/extension, you may choose to lop them off in extensions.conf, but aside from that this is fairly straight forward.

   
  On 9/14/05, C. Savinovich <c.savinovich at earthlink.net> wrote: 

      Hello everyone, I am pulling my hair here because a carrier threw me curve early today.

      They want to send calls to my asterisk server using SIP.  Then they said that their gateways don't have to register with my server, that all they have to do is send a prefix for validation.  Whereas I can think of several ways to authenticate their incoming number string, I am only used to the orthodox SIP way which is: client registers to my proxy.   Guess what, I can't find any samples on this!!, Can anyone please help?, I will probably need a sample sip.conf.   and then, to make a test call, I can use another asterisk box and try asterisk to asterisk sip calls (without register) via the cli prompt.   But I have no idea.... and I am intrigued.

      Thanks
      CS


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