asterisk users - Aug 2007 - Receiving SIP calls without registeration and dynamic IP address

Hi List;

How can I configure asterisk to receive a call from
SIP end point without being registered at asterisk and
its IP address is dynamic, and authentication to be
based on the username and password or any other
string?

I know that if I place the host with static IP then no
need to register, but what if the voip gateway was
having dynamic IP and I do not need to register on
asterisk, but I need to send the call directly and
asterisk authenticate the device based on the username
and password or any possible string?

Regards,
-----------
ITS
IP Telephony and Contact Center Engineer
Eng. Bilal Ghayad
Mobile: 00965 9849460


       
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On Thu, 2007-08-02 at 08:11 -0700, bilal ghayyad wrote:
> How can I configure asterisk to receive a call from
> SIP end point without being registered at asterisk and
> its IP address is dynamic, and authentication to be
> based on the username and password or any other
> string?
I think you're confused here... registration has nothing to do with a
SIP device being able to send calls to Asterisk.  A SIP devices
registers with Asterisk so that Asterisk knows where to send calls going
*to* the device.

For calls coming into Asterisk, the SIP channel driver first looks at
all the users in sip.conf (you know, everything set with type=user or
type=friend).  It matches on the name in square brackets as the SIP
username, and the password on the "secret=" line.  If the device
authenticates correctly, the call gets sent to the dialplan in the
context specified by the "context=" line.

As an example, let's say we had the following in sip.conf:

[test]
type=user
secret=abc123
context=hamburger

If any SIP device were to come along and authenticate with the username
"test" and the password "abc123", Asterisk would accept the
call and
send the call to the [hamburger] context in the dialplan.  Asterisk
would do this *whether or not* the device had registered.

Now, as I understand it, if Asterisk can't find any users (or friends)
that match, it then goes looking through the list of peers, trying to
match the "host=" field to the IP address of the device that's
sending
the call to Asterisk.

Hopefully that clarifies things for you.


-- 
Jared Smith
Community Relations Manager
Digium, Inc.

Bilal,

The purpose of registration is to establish a contactability/reachability 
URI information in the registrar dynamically.   If you have a static IP on
both ends you can nail up an IP-trusted peer session / SIP trunk.   If 
not, some form of registration will be required.

Registration does not necessarily require a username and password;  in 
fact, it is rarely sent with the registration anyway.  Instead it is
usually sent as a response to a 407 proxy challenge in subsequent
requests, unless the REGISTER message is interrogated with that prior to
being accepted, which depends on how you have the UAS configured.

Other than that, not quite sure what you're asking precisely...

-- Alex

On Thu, 2 Aug 2007, bilal ghayyad wrote:
> Hi List;
>
> How can I configure asterisk to receive a call from
> SIP end point without being registered at asterisk and
> its IP address is dynamic, and authentication to be
> based on the username and password or any other
> string?
>
> I know that if I place the host with static IP then no
> need to register, but what if the voip gateway was
> having dynamic IP and I do not need to register on
> asterisk, but I need to send the call directly and
> asterisk authenticate the device based on the username
> and password or any possible string?
>
> Regards,
> -----------
> ITS
> IP Telephony and Contact Center Engineer
> Eng. Bilal Ghayad
> Mobile: 00965 9849460
>
>
>
>
____________________________________________________________________________________
> Moody friends. Drama queens. Your life? Nope! - their life, your story.
Play Sims Stories at Yahoo! Games.
> http://sims.yahoo.com/
>
> _______________________________________________
> --Bandwidth and Colocation Provided by http://www.api-digital.com--
>
> asterisk-users mailing list
> To UNSUBSCRIBE or update options visit:
>   http://lists.digium.com/mailman/listinfo/asterisk-users
>
--
Alex Balashov
Evariste Systems
Web    : http://www.evaristesys.com/
Tel    : +1-678-954-0670
Direct : +1-678-954-0671

Hi Alex;

Kindly find my answers below preceeded by ( * ).

Bilal,

The purpose of registration is to establish a
contactability/reachability URI information in the
registrar dynamically.

* What is the URI?

If you have a static IP on both ends you can nail up
an IP-trusted peer session / SIP trunk. If not, some
form of registration will be required.

Registration does not necessarily require a username
and password;  in 
fact, it is rarely sent with the registration anyway. 
Instead it is
usually sent as a response to a 407 proxy challenge in
subsequent
requests,

* Who send the 407 proxy challenge and what is that
407 proxy challenge?

 unless the REGISTER message is interrogated with that
prior to being accepted, which depends on how you have
the UAS configured.

* What is the UAS, also I did not get u in this
paragraph.

Other than that, not quite sure what you're asking
precisely...

* I was asking if the endpoint send a call, and it has
a username and password typical to that configured in
SIP.conf file, then should this end point being
registered or not?

Regards
Bilal


       
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> * I was asking if the endpoint send a call, and it has
> a username and password typical to that configured in
> SIP.conf file, then should this end point being
> registered or not?
If you are only *SENDING* calls to asterisk and not receiving, you do
not need to send a registration.   You only need to send a
registration if you want to *RECEIVE* calls from asterisk.