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Topic # 90842 30-Sep-2011 18:36
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The organisation I am assisting wants an 'outward' call centre of 6 phones and suggested using VOIP on mobile broadband. Required for two months only (ie up to election day). I did some sums and it seems feasible on paper, but I have a gut feeling there has to be a 'catch' somewhere. Other option would be naked ADSL2+ , any idea how many VOIP's could work on this assuming fairly favourable circumstances. We would need quality to be a bit better than a Manila boiler-room operation.

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  Reply # 527815 30-Sep-2011 18:40
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There is no QoS for voice packets on mobile broadband if you have issues no carrier is going to offer you support

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  Reply # 527824 30-Sep-2011 19:14
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Latency will be too high on mobile bb. 




 
 
 
 


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  Reply # 527837 30-Sep-2011 19:47
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No way you would run that over mobile broadband. probably best to sign up to something like Xnet naked DSL and use their VOIP service as its zero rated. Also you will probably need to use g729 for the codec to support that many calls on ADSL2 due to the slow upload speed. Could run VDSL2 if you want g722 or g711





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  Reply # 527898 30-Sep-2011 22:55
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Forget it over mobile. End of story.


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  Reply # 528005 1-Oct-2011 13:27
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OP you need to budget ~85k per concurrent connection if you use the 711a codec in my experience.

If you use 729(?) then you should get away with less in theory.

Personally I don't try to push the envelop, and I just use 711a.

If you're thinking about using mobile data then you need to do a proper proof of concept at the given location to see how well it works. Remember, if lots of people turn up using their mobile phones at the same time then you're sharing the network capacity with them. Ie: you do your testing with no staff, your staff show up with 6 phones... see where this is going?

The DSL2+ does seem like the smarter option.

You will also need to test the DSL to ensure that at the given location, with the chosen ISP, you can get the throughput that you need. Just because your modem says it's syncing at xxx doesn't mean you can push the data.

You also need to make sure that nothing else using your DSL drowns your phone data.

HTH.





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  Reply # 528009 1-Oct-2011 13:46
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DonGould: OP you need to budget ~85k per concurrent connection if you use the 711a codec in my experience.



That's per channel, and two channels make up a call.

I'd never attempt to support 6 concurrent ulaw or alaw call across ADSL2+, it may work, but you're cutting things very fine for a best effort service. The best bet is to install HSNS.






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  Reply # 528028 1-Oct-2011 15:42
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sbiddle: That's per channel, and two channels make up a call.

I'd never attempt to support 6 concurrent ulaw or alaw call across ADSL2+, it may work, but you're cutting things very fine for a best effort service. The best bet is to install HSNS.


Sorry I don't understand the 2 channels comment.

I just watch my usage meter and see it's using ~85k.  Are you saying it should be using 170k for a phone call?

That would mean d2+ will only deal with 3 concurrent calls at most wouldn't it?

HSNS - ouch... might be cheaper to run POTS or ISDN in?






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