I want the modem to be able to support more than 5 VoIP lines as well.
This is for a school that has 10 VoIP lines with 2talk but getting lots of network errors and when I restart the current TP-link modem its fine. Can you please confirm if the Draytek or Cisco 5xx will be able to support this.
No sweat. Does the school have a PABX? Or just registering some phones straight to 2talk? Might have better results installing a proper pabx with digital phones and have the 2talk trunks terminate on the system. You will get a lot more features too.
You should never plan on any more than 3 or 4 simultaneous calls on an ADSL2+ connection unless you're willing to compromise voice quality and switch to a much lower bitrate codec.
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We have a Cisco UC320 here that does the job quite nicely. It looks after our data and also our phones - connected to 2talk and works a dream - track down coffeebaron - he sorted ours quite nicely.
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