[cisco-voip] Loopstart vs Groundstart

[Joel Perez]

I just finished setting up an SRST site in PR and tried using LoopStart with
the carrier there. Had nothing but headaches due to the carrier not sending
the correct disconnect signal on the line.
I used the typical timeout timers in the config and that worked about 70% of
the time. But if the call went unanswered and the AA picked up then the port
would stay off-hook for about 5 mins till the AA would time out even if the
calling party hung up. We got TAC involved and they confirmed what we saw.
We ended up having the carrier switch the lines to GroundStart and have been
happy since.

I guess it depends on carriers and regions.


Joel P.

On Wed, Mar 3, 2010 at 4:48 PM, Mike Thompson <mthompson729 at gmail.com>wrote:

> Loopstart = easier install (90+% of installs if I had to guess), no earth
> ground required, low likelihood of of audio hum
>
> Groundstart = MUCH less common, earth ground required and not always
> readily available, almost no hum.
>
> Sent from my phone, apologies for any typos.
>
>
> On Mar 3, 2010, at 4:41 PM, Mike King <me at mpking.com> wrote:
>
>   I'm just confirming what used to apply to my old PBX still holds true
>> with a VIC2-4FXO in a 2921 router.
>>
>> For analog lines from the PSTN:
>>  Loopstart bad
>>  Groundstart good
>>
>> The application is I'm bringing up a small SRST site, and we are replacing
>> they're old key phone system.  I have no idea what the existing lines are,
>> but we have enough time to change the type out.
>>
>>
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