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SIP Configuration - UK VoIP providers?

OliverCrocombe

Hello,

We're having a nightmare configuring our current VoIP phone system with the Sophos UTM 9.

The client/server provided by our provider has been configured under the SIP settings, but we still have these problems:

- Delays for outgoing calls (10-15 second pause when dialling out)

- Frequent SIP attacks from random numbers (e.g. 3001, 101).

Does anyone have any ideas where to start, or can recommend a VoIP provider in the UK that has good support for Sophos firewall?

Thanks,

Oliver



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  • 0 in reply to sachingurung

    Hi Sachin,


    Thanks for coming back to me.

    We configured the SIP settings as described, using the information provided by our provider (attached).


    However, we still have the problems described.

    The main issue for us is the SIP attacks, as it causes disruption for our users. The numbers calling in on the phones are random: e.g. 101, 1001, 3001, 201, 'test'. The line is silent when you answer.


    Our Expectation is set to Any. Could this be letting the attacks in?


    If we change it to Client/Server, the phones don't work at all.


    Thanks,


    Oliver

  • 0 in reply to OliverCrocombe

    Hi, Oliver, and welcome to the UTM Community!

    Please attach pictures of the UTM VoIP configuration as well as any relevant NAT or Firewall rules.  Do we understand correctly that you have no internal VoIP PBX?

    Cheers - Bob

  • 0 in reply to BAlfson

    Hi Bob,

    Thanks for the reply!

    I have attached some screenshots below of our current VoIP configuration.

    No internal VoIP PBX.

    Our Expectation Mode is set to 'Any'. Could that be causing the attacks? If we set it to client/server only, the phones do not work at all (engaged tone when dialling out or in).

    Thanks,

    Oliver

  • 0 in reply to OliverCrocombe

    What happens if you eliminate "NTP Server Pool" from 'Sip Server Networks' and then configure for "Client/Server" expectation?

    Cheers - Bob

  • 0 in reply to BAlfson

    Hi Bob,

    You're a genius! After removing NTP Server Pool, client/server expectation is working.

    Hopefully that's the end of our attacks.

    Thanks for your help.

    Best regards,

    Oliver