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10 Sipgate SIP connections on one ADSL connection?

Posted on 2014-02-06
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Last Modified: 2014-02-13
We have two ADSL connections into one router which can prioritise traffic based on port numbers and/or dedicate one of the ADSL connections to the SIP data.

However, both connections are only 8 Mbps download and about 0.75 Mbps upload.

We'd like to use Sipgate's "Sipgate Team" product to have 8 to 10 users, so upto 10 SIP phones (something like the Snom 320 handset).  

I don't imagine that more than 4 or 5 users would ever actually be using the phone at the same time.

Does anyone have experience of having so many VoIP phones on such a relatively poor connection?  Is it likely to work?  Anything we can look out for that might give us problems?
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Question by:RedLondon
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Garry Glendown earned 2000 total points
ID: 39841185
Short answer: No.

Long answer: Depends on the bandwidth of the ADSL lines and the number of concurrent calls. Unless you use a highly compressed Codec, you should calculate an active channel with ~100kbit/s. So with 4-5 active calls (and priority for voice data), you could get bye with 500kbit/s bandwidth ... with your numbers, up to 8 calls would possibly still work, albeit I'd expect problems once you hit 7... (not sure how well your router is able to distribute the calls to the two lines ... I'm always a bit skeptic about load balancing on those kind of lines ...)
Also ensure that your latency to Sipgate should be well below 100ms, with minimal packet loss ...
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