[asterisk-users] High delay from Asterisk as PSTN simulator

[Gustavo Santos]

Ok, I will try to do something like this. Thank you very much for the help.

2011/9/16 Kevin P. Fleming <kpfleming at digium.com>

> On 09/15/2011 10:46 AM, Gustavo Santos wrote:
>
>> I understand. I'm interested in simulate the real situation because I'm
>> doing an academic comparative between algorithms, and is really
>> interesting have all possible situations.
>> In the real situation I use a E1 to connect a PBX through a R2 link, so
>> I want to try change DAHDI to 10 ms... What should I modify?
>> Any other sugestion to make it works?
>>
>
> Changing chan_dahdi to use 10ms packet size is *still* not going to solve
> your problem; when a 10ms packet is read from the incoming channel, the
> transmission of it on the outgoing channel will not overlap; it will begin
> as much as 10ms later, resulting in as much as 20ms of latency.
>
> The only way you are going to be able to use Asterisk in this scenario is
> what I outlined before; you will need to have Asterisk call back out over
> the same E1 to your test device, and let the DAHDI native bridging bridge
> the two channels on the E1 card itself; this will result in no more than 1ms
> of latency between the channels. Alternatively, it is conceivable that DAHDI
> could be modified to have a loopback mode, and a special dialplan
> application constructed to trigger it... and then a single channel could be
> looped back towards its source, on demand, with nearly zero latency.
>
>
> --
> Kevin P. Fleming
> Digium, Inc. | Director of Software Technologies
> Jabber: kfleming at digium.com | SIP: kpfleming at digium.com | Skype: kpfleming
> 445 Jan Davis Drive NW - Huntsville, AL 35806 - USA
> Check us out at www.digium.com & www.asterisk.org
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-- 
Atenciosamente,
Gustavo Santos.
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