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VOIP using RAIN 4G

Friend has RAIN 4G at his home in Kenilworth using a D-Link DWR-922 

Speeds are:   35 mbps down and 8 mbps up

His IP phone will connect for not more than 1 minute

After 2 months enquiring with RAIN, he was told the router is incompatible with VOIP, yet the spec states it supports VOIP

Any idea how this can be resolved?

The transport protocol was changed to TCP

Please change the transport back to UDP.

On the D-Link router itself under the ALG settings also ensure that 'SIP' is not ticked.

Okay had to disabled the dam SIP ALG on the B618 Huawei then on my USG enable SIP that side 

Perfect, thank you for the feedback.

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