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Call hangs up immediately when answering after some time

I have the following setup:

Yealink W60B 77.83.0.65

- Vuma/Vox fibre internet

- Vox default Mikrotik router


Originally I had this issue:

http://help.freshphone.co.za/support/discussions/topics/17000016372

but was solved.


If I reboot my device everything works fine for around a day or so, but then all incoming and outgoing calls automatically disconnect when the call is answered.


The same exact phone works fine on another router/isp.


Is there anything I can do to sort this out?


Regards,


The following need to be disabled on your Mikrotik router:

SCTP

DCCP

UDP Lite

SIP Direct Media

Those have been disabled as per http://help.freshphone.co.za/support/discussions/topics/17000016372. But now having this issue. Any other suggestions?

Ask your ISP to allow bidirectional UDP traffic to and from 41.221.5.251 on port 5060, and RTP traffic on ports 10 000 - 20 000

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