[asterisk-users] load balancing

[Ron]

Hi Greyman,

Should it look like this now? Can i use 2 SIP Proxies just to make sure 
i have a backup? will that cause any problem again with regards to 
calling extension to extension? Extensions will register on the asterisk 
still? How about outbound calls to other SIP provider or a telcobridge, 
SIP proxy will handle that also? Basically asterisk will ask SIP proxy 
of everything? Will RTP stream still go thru asterisk?

Also, i plan on setting these up as a Virtual PBX for multiple offices, 
which means company A can only use Trunks for A, B is for Trunk B etc 
etc. Does outbound to trunks have any issues? or problem is just 
basically calling extension to extension?


[other voip provider]                    [telcobridge] -- [pstn]
            |                                    |
--------------------------------------------------------------------
[                              SIP Proxy                           ]
--------------------------------------------------------------------
       |                 |                 |                  |
[ asterisk 1 ] -- [ asterisk 2 ] -- [ asterisk 3 ] -- [ asterisk 4 ]
       |                 |                 |                 |
--------------------------------------------------------------------
|                         mysql cluster                            | 
--------------------------------------------------------------------


Thanks

Regards,
Ron


Grey Man wrote:
> On Fri, Feb 29, 2008 at 2:01 AM, Ron <ron at silverbackasp.com> wrote:
>> Hi All,
>>
>>  If i have this kind of setup, what do i need to make it's load balance.
>>
>>  [ asterisk 1 ] -- [ asterisk 2 ] -- [ asterisk 3 ] -- [ asterisk 4 ]
>>        |                 |                 |                 |
>>  ---------------------------------------------------------------------
>>  |                         mysql cluster                             |
>>  ---------------------------------------------------------------------
>>
>>  I plan on doing it via DNS SRV only, but if a user register on asterisk
>>  1 how can users at asterisk 4 reach that user. Thank You
>>
>>  Regards,
>>  Ron
>>
> 
> Hi Ron,
> 
> If you're using realtime each Asterisk server will know where every
> user is irrespective of which Asterisk server they registered on. The
> problem is NAT, if a client is behind NAT and registers on server 1
> then server's 2,3 & 4 are unlikely to be able to get through to it.
> Last time I lookedthe Asterisk realtime engine doesn't record which
> server an account registered on in the database so the only option I
> can think of would be to forward an incoming call for a user to all 4
> of your Asterisk servers that way the call will get through but if
> they are not behind NAT they'll get 4 incoming calls.
> 
> Bascially it's messy using the set up you've got. What you really need
> is a SIP Proxy (assuming you're using SIP, if not it's even trickier).
> The SIP Proxy could load balance requests across your Asterisk
> servers. For calls destined for your users you can use the
> outboundproxy field in the sippeers table, by setting it to the IP
> address of your SIP Proxy server you can get Asterisk to forward all
> requests for a SIP account through the proxy (there is also an
> outboundproxyport setting but avoid it as it's been broken forever).
> 
> There are a few gotchas with a SIP Proxy the main one being transfers.
> But if you can get away with not allowing transfers then you are best
> to do so as the CDR's Asterisk produces are wrong anyway.
> 
> Regards,
> 
> Greyman.
> 
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