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5 posts

Wannabe Geek


Topic # 161846 21-Jan-2015 15:59

We're in teh process of setting up a Grandstream UCM6102 PABX in our offices.  It currnetly has two analogue trunks (both over ATA's from different providers) that we're phasing out and replacing with all our lines coming over a 2Talk SIP trunk.

While testing today from a vodafone mobile, we noticed that the incoming line rings about five times before the extension starts ringing.  Can we improve this, or is that normal?

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  Reply # 1219283 21-Jan-2015 16:02
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How long between the mobile ringing the and SIP INVITE hitting your PBX?





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Wannabe Geek


  Reply # 1219316 21-Jan-2015 16:54

Without being too scientific about it - it seems to be about ten seconds (or three rings on the mobile before the extension rings).

Seems to be worse on the ATA lines compared to the SIP trunk.

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  Reply # 1219323 21-Jan-2015 17:02
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So 10 seconds from the ringing starting until the SIP INVITE hits your PBX?



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  Reply # 1219338 21-Jan-2015 17:17
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As above, you need to figure out if the delay is actually happening locally or simply just within the mobile/2Talk network.

Do some packet traces and see what happens.

As for the ATA's.... the delay you see there might be the PABX listening for CLI info but none is being transitted from the ATA. The fix would be on the PABX tell it not to listen for CLI on the analogue trunks.



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  Reply # 1219341 21-Jan-2015 17:24

Might have to investigate this in more depth.  SIP lines seem fine - calling from extension > PABX > 2talk > PABX >other extension works fine.  Receiving extension is ringing before the end of the first caller ring (if that makes sense)

Analogue lines (VOIP to ATA to PAXB FXS) has the long lag time.

An easy fix would be to port all the numbers to 2Talk, but I'd like to understand if there is a way to improve the 'analogue' trunks.  Suspect it might be related to the Digital > Analogue > Digital conversion?

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  Reply # 1219388 21-Jan-2015 18:57
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Seems a bit bizarre to have your trunks on ATA's if your PABX is SIP capable. I assume they are a managed service so you dont have the registration details?

I would guess that the delay you are experiencing is probably a mix of the fact that the ATA's are in the middle, but also the PABX is looking for CLIP info but not getting it from the ATA.



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Wannabe Geek


  Reply # 1219870 22-Jan-2015 10:34

Running the ATA's is not ideal - that's why we're moving to the PABX and consolidating all the numbers to one provider.

But until the numbers are provisioned across, we've got this long delay on analogue lines. 

Sound like we might just have to live with it for a week or so.

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  Reply # 1219894 22-Jan-2015 11:14
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There are various reason. Without knowing the hardware, how it's configured and looking at a SIP trace and seeing the timings of the SIP OPTIONS it's not possible to help you any further.

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  Reply # 1220289 22-Jan-2015 18:19
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I see that unit has a 'LAN' and 'WAN' port. Do you have the option to mirror the interfaces? If yes, then do that and run a packet capture with wireshark. 

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