[SR-Users] Calling users on another kamailio server

[Charles Chance]

Hi,

Yes, you are right - and I agree, it would be better if this was possible :)

Charles




On 16 September 2013 14:15, Peter Dunkley <peter.dunkley at crocodilertc.net>wrote:

> Hello,
>
> It'd be better if the "add_path()" function could be used here.  That way,
> if using outbound (RFC5626), the flow-token (the userinfo part of the
> Path-URI) would be present and there would be no need to add the
> ";received" parameter.
>
> This would address the one issue remaining for SIP outbound on Kamailio,
> which is its use without an edge proxy that is separate from the registrar.
>
> Regards,
>
> Peter
>
>
> On 16 September 2013 14:05, Charles Chance <charles.chance at sipcentric.com>wrote:
>
>> Hi,
>>
>> This sounds like a case for sharing same database, and adding Path before
>> saving incoming register. That way, no need to replicate register message
>> to other servers and all subscribers use the same domain.
>>
>> Add path something like this before calling save():
>>
>>                         append_hf("Path: <sip:$Ri:$Rp;
>> received=sip:$si:$sp;lr>\r\n");
>>                         msg_apply_changes();
>>
>> Whichever server receives the incoming invite, will perform lookup and
>> automatically route to the server which received the register. On the
>> proxying server set $du according to received param of route header, add
>> record-route, and then t_relay(). As Daniel said, no need to
>> re-authenticate or perform lookup again.
>>
>> Regards,
>>
>> Charles
>>
>>
>>
>> On Mon, Sep 16, 2013 at 7:34 AM, Daniel-Constantin Mierla <
>> miconda at gmail.com> wrote:
>>
>>> Hello,
>>>
>>>
>>> On 9/12/13 10:08 PM, Brian Wallen wrote:
>>>
>>>> I currently have two independent kamailio servers. I'd like to set them
>>>> up in a way that user1 on server1 can make a call to user2 on server2.
>>>> After searching I've come up with two ways that this might be able to be
>>>> done. Can someone please sanity check these or point me in the right
>>>> direction?
>>>>
>>>> 1. Have one registrar server and convert the other server to a proxy
>>>> 2. Keep them both as registrars and somehow make them each aware of the
>>>> users on the other server
>>>>
>>>> I like 2 better because if one server went down users on the other
>>>> server would still be up. The only thing is I don't know how to set the
>>>> servers up to communicate with each other.
>>>>
>>> the nat can create problems when a server is down - if the nat is
>>> symmetric, only the server that received the registrar can send back calls
>>> to the phone.
>>>
>>> Communication between users on two servers is as simple as using
>>> t_relay_to("proto:serverip:**port") after you do lookup("location") and
>>> no record is found.
>>
>>
>> Suppose I have three or more kamailio servers. If a call comes in and
>> lookup() returns that no record was found, how do I know which server to
>> forward to? Is that a case in which I should replicate the database?
>>
>>
>>> You have to add an extra check for the case the call was coming from the
>>> other server, not to forward back to it in case of no found again.
>>
>>
>> Thanks for the tip, I hadn't thought of that.
>>
>>
>>> Also, you should skip user authentication for calls from the other
>>> server (not do authenticate twice). Another aspect to take care is chaining
>>> rtpproxy, you have to use the flat for trusting the other server (r, iirc).
>>>
>>> You can also replicate the registration, but again, it can add troubles
>>> to the nat. Look at t_replicate() (in tm module).
>>>
>>> Cheers,
>>> Daniel
>>>
>>> --
>>> Daniel-Constantin Mierla - http://www.asipto.com
>>> http://twitter.com/#!/miconda - http://www.linkedin.com/in/**miconda<http://www.linkedin.com/in/miconda>
>>> Kamailio Advanced Trainings - Berlin, Oct 21-24; Miami, Nov 11-13, 2013
>>>   - more details about Kamailio trainings at http://www.asipto.com -
>>>
>>>
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>>>
>>
>>
>>
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>
>
> --
> Peter Dunkley
> Technical Director
> Crocodile RCS Ltd
>
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>


-- 
*Charles Chance*
Managing Director

t. 0121 285 4400    m. 07932 063 891

-- 
www.sipcentric.com

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