[cisco-voip] Loopstart vs Groundstart

[Wes Sisk]

yep. groundstart usually brings better connect/disconnect supervision.  
unfortunately it's also more rare and therefore typically more difficult 
to get working.  it's not your typical every day circuit. if you are 
fortunate enough to get good people and you also get good electrical 
properties (emphasis on ground) then it is "better".

/wes

On Wednesday, March 03, 2010 5:00:20 PM, Joel Perez <tman701 at gmail.com> 
wrote:
> 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 
> <mailto: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
>     <mailto: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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