[OpenSIPS-Users] Question about mediaproxy relay preference

[Brett Nemeroff]

I think this is a really good idea.

What about having a mediaproxy modparam for "relay_group".. So a relay
group could be "east_coast" or "west_coast" and you can send that as
the preference (and OpenSIPs caches the IPs for the group and sends
them pre-looked up to dispatcher)

Just my $0.02.

Also, with preferred relays specified, will non-prefered relays every
be picked? I can think of a handful of circumstances where you'd
absolutely not want a non-prefered relay to ever be allowed.


-Brett


On Wed, Apr 7, 2010 at 2:45 AM, Saúl Ibarra Corretgé
<saul at ag-projects.com> wrote:
> Hi,
>
> On 5/4/10 10:13 PM, Henk Hesselink wrote:
>> 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).
>>
>
> Currently only a single preferred relay can be used. The send_command
> method from the RelayFactory class is responsible for selecting the
> relay which will be used, currently in a random way if no preferred
> relay is specified.
>
> The preferred relay is specified from the OpenSIPS configuration file
> through an AVP and the mediaproxy module sends this information to the
> dispatcher through the 'update' command. So that function would also
> need modifications.
>
> Now the tricky part would be to decide where to do the actual DNS lookup.
>
>   - If the lookup is done in OpenSIPS, you could pass a space separated
> list of relays (in the right order) which would be appended at the
> beginning of the list.
>
>   - Do the lookup in MediaProxy.
>
> I'd rather not do it on MediaProxy, as this would increase the
> complexity and add delay (due to the DNS lookup) to the setup of the call.
>
> Having that said, here is my proposal: modify both OpenSIPS module and
> MdediaProxy to accept a list of space separated relays. The way of
> building that list should be decoupled from the whole process IMHO, so
> you could do it by having the DNS query results cached somewhere. This
> would prevent the delay that DNS query may cause.
>
>
>
> Regards,
>
> --
> Saúl Ibarra Corretgé
> AG Projects
>
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