Alternatives to Billion Modem for Digital VOIP

We have a Billion 7800VDOX. As of this week, on our Cisco VOIP phones outbound calls to mobiles don't ring or ring and then drop. No problem with outbound calls to landlines. No problem with inbound calls from mobiles.
iinet tested the lines from their end & there is no problem. All the settings in the modem are correct. iinet advised that there is probably a fault with the modem.
Can anyone recommend a good digital VOIP modem alternative to Billion?

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