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I use Magicjack with this modem/router and have for many years with no problems.  Within the last month, the call quality has gone down.  I have replaced all phones, cables, jacks, etc. with no success.  Magicjack tech support says it may be the following router/modem settings:

Need to open up the UDP ports 5060 thru 5070 and must disable the SIP ALG.

Tried to have Spectrum do these tasks, but I own the modem/router outright and they can’t/won’t address the unit because I own it.

 

Can you assist with these issues??

 

 

 

You can do port forwarding on your modem interface by following the steps mentioned on the below article.

  http://arris.force.com/consumers/articles/General_FAQs/SBG6700-AC-v8-6-x-Port-Forwarding-Setup

On the interface after login you can see Advanced> options> NAT ALG Status> SIP- disable and then click Apply to setup SIP on the modem interface.

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