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345 posts

Ultimate Geek
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# 176934 16-Jul-2015 15:48
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Hi all, 

This post has two aspects to it. I am looking for some advice as to where the potential constraints could be, then in turn if there is any constraints, some advice on what products I should be looking at would be fantastic, firstly though let me tell you a bit about the problem I'm encountering, it may be fairly simple but my experience in this area is limited. 

So the current setup is a Telecom/Spark generic ADSL modem connected to (you guessed it) an ADSL line with POTS and a basic PBX which in turn relay the audio from the sites audio system over the phone. The ADSL modem is service Wireless clients also.

This is used for conferencing into the site to dial in to listen to the seminars being given, however every so often when there are roughly 5 or more people dialed into the phone to listen, they experience what can be described as dead air - more than a few seconds of no audio.

My initial suspect was the router/ modem not being able to handle the traffic, as it only has 100mb ethernet ports etc so it is probably straining with serving the wireless clients and also relaying the audio being heard over the telephone line.

My question is, in order to resolve  the issue, what should I be looking at? Replacing the router/modem? Implementing some basic QoS? I haven't done any fault finding on the line (YET) as it appears to be working fine.  

Any advice/ being pointed in the right direction is going to be greatly appreciated, and if I have left anything out for you, please just post and I will try clarify it to the best of my ability. 

Cheers






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27969 posts

Uber Geek
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  # 1345596 16-Jul-2015 16:36
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5 concurrent calls over ADSL2+ over what I assume is a shared connection is just asking for trouble.



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Uber Geek
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  # 1345608 16-Jul-2015 16:59
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VDSL should help. Plus some kind of QOS?

 
 
 
 


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Uber Geek
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  # 1345611 16-Jul-2015 17:02
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What kind of upstream speed are you getting on the ADSL connection?



345 posts

Ultimate Geek
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  # 1346272 17-Jul-2015 14:22
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Dairyxox: VDSL should help. Plus some kind of QOS?


Would love to get VDSL at the site, however, typical case in nz, most places can't get it. 




4th gen i7 Haswell 4770k, G.SKILL RipjawsX 16GB (4x4 Gb) DDR3 2400MHz, x1 GTS 460, Intel 180Gb 530 Series SSD, x1 Seagate 1Tb HDD, x1 Seagate 2Tb HDD, Modular 850w PSU, R.O.G. Maximus VII Formula mobo, Cooler Master Storm Trooper Chassis, Cooler Master V8 CPU cooler

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345 posts

Ultimate Geek
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  # 1346273 17-Jul-2015 14:22
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ubergeeknz: What kind of upstream speed are you getting on the ADSL connection?


I'll post them when I'm there next. No remote access unfortunately.




4th gen i7 Haswell 4770k, G.SKILL RipjawsX 16GB (4x4 Gb) DDR3 2400MHz, x1 GTS 460, Intel 180Gb 530 Series SSD, x1 Seagate 1Tb HDD, x1 Seagate 2Tb HDD, Modular 850w PSU, R.O.G. Maximus VII Formula mobo, Cooler Master Storm Trooper Chassis, Cooler Master V8 CPU cooler

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98 posts

Master Geek
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  # 1352400 27-Jul-2015 10:51
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Initially you need something better than the ISP supplied modem for this situation. With 5 concurrent calls I'm guessing this is a business environment? Get a proper network gateway in there that can log & monitor traffic. The logging on this will give you insights into where the traffic is going. Doing anymore troubleshooting without a proper gateway in place is a waste of time (imo).

Consider buying a 2nd naked ADSL line for voice only, especially if your SIP provider also provides internet connectivity. This way you will get guaranteed throughput and latency all the way to their SIP proxy.

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Ultimate Geek
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  # 1352503 27-Jul-2015 12:59
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Breakaway normally one will need a Plan that comes with a SLA to ensure an ISP applies a CIR value to their voice packets.  

 
 
 
 


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Master Geek
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  # 1352509 27-Jul-2015 13:08
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Correct -- should have clarified that. Although just separating the voice traffic out (QoS or not) so it isn't fighting other non-time sensitive traffic can make a pretty big difference.



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Uber Geek
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  # 1352952 27-Jul-2015 22:52
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i'd go for the easy solution of just having one adsl connection for voice, and one for data.  assuming can just get another connection installed easily enough.

i suspect the issue could be something like buffer bloat on the upload side.  or some weird prioritisation stuff.

you could also test with the normal wireless stuff disconnected and see if you can reproduce.


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