[OpenSIPS-Users] Question about mediaproxy relay preference

[Henk Hesselink]

Hi Adrian,

The way I read the code I can indicate one preferred relay, but not a
set.  So I can't say "prefer this set of relays (i.e. the ones in this
particular datacenter) over the rest".  That's less flexible than the
SRV style.

What would be great would be a dispatcher option to say "based on the
media streams in the SDP, prefer 'local' relays" for some definition of
local - for instance relays that are on the same subnet as one or more
of the media endpoints.  I might be able to code up a patch for that if
you can give me a hint where to start (looks like that would be the
send_command method in the RelayFactory class).

Henk


Adrian Georgescu wrote:
> Yes, it blows away the DNS SRV concept. The new model where media
> relays automatically connect to one or more dispatchers using TLS is
> much more secure and has more self-organizing properties then
> statically configured DNS that can hold a limited amount of records.
> Still you have full control to promote a chosen relay on top of the
> list if you want to. You just need to work out a bit your
> configuration for achieving this.
>
> Adrian
>
> On Apr 2, 2010, at 2:46 PM, Brett Nemeroff wrote:
>
>> Adrian,
>> I do this in a few configurations. However, it kinda blows away the
>> whole DNS SRV features, doesn't it? Anyway to indicate a mediaproxy
>> preference without nailing to a specific one?
>>
>> -Brett
>>
>>
>> On Fri, Apr 2, 2010 at 2:30 AM, Adrian Georgescu<ag at ag-
>> projects.com>  wrote:
>>> You have control over which MP is selected by setting an AVP in the
>>> proxy routing logic. So you can make some checks about your topology
>>> and then fetch the relay address from a database.
>>>
>>> Adrian
>>>
>>> On Apr 2, 2010, at 1:46 AM, Henk Hesselink wrote:
>>>
>>>> We're moving our mediaproxies to 2.0 and have run into the
>>>> following: in
>>>> the old setup we used the priority value in the mediaproxy SRV
>>>> records
>>>> to prefer local (same datacenter) relays but to failover to a
>>>> different
>>>> datacenter if all local relays were unavailable.  We then used the
>>>> SRV
>>>> weight value to load balance between different capacity relays
>>>> within
>>>> the datacenter.
>>>>
>>>> With 2.0 using conntrack we don't need to load balance anymore, but
>>>> we'd
>>>> still like to be able to prefer a local relay.  Right now a call can
>>>> be
>>>> completely in one datacenter and yet have the relay in a different
>>>> one,
>>>> causing unnecessary latency.
>>>>
>>>> Ideally when a dispatcher sees that an endpoint of a call is on the
>>>> same subnet as any of its relays, then it should prefer those
>>>> relays.
>>>> Is something like that possible?
>>>>
>>>> Regards,
>>>>
>>>> Henk Hesselink
>>>>
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>>>
>>>
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>>
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