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Silent Audio Calls

David Jumbi

Hi I have a Sophos XG-125 (new deployment). I am having silent calls from one extension to another within the organization. SIP works fine as the call can be placed and received but the media isn't going through (RTP not somehow not flowing). I have tried both system system_modules sip load and system system_modules sip unload commands but there was no change. Anyone has a solution to this its really bugging me.



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    Hi David,

    Are you using Cisco phones by chance and/or using Cisco voice gateways in your network?    I've had this issues in the past but with remote sites and their use of Voice gateways before and experienced some of the same issues. 

    Also...

    If these vlans are solely for voice traffic you may want to try the big hammer approach which is bypassing stateful firewall inspection between the PBX and voice networks.  If this works, it could be quite possible you have asymmetric routing going on inside your network.

    from the console cli  (option  #4 I think) look into bypassing the networks:

    set advanced-firewall bypass-stateful-firewall-config add source_network  YOURVOICENET source_netmask YOURvoice_NETMASK dest_network YOUR_PBXNET dest_netmask YOURPBX_NETMASK  

    and then repeat the rule for the traffic going in the opposite direction.    FROMPBXNET --> VOICENET  . So  you'll have two rules for each set of networks you need to bypass firewall inspection on.

    Give that a try...

    Once again this is the big hammer approach and basically turns off firewall features  for the networks you specify in the rule so that the Sophos is simply routing traffic between those networks - this means you wont see any traffic on those firewall rules you setup in the GUI  after this point. 

    If this works somewhere you have traffic going down the pipe in one direction and coming back a slightly different way (weird route  someplace etc)

    Good Luck!

    -Scott

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  • 0

    Hi David,

    Are you using Cisco phones by chance and/or using Cisco voice gateways in your network?    I've had this issues in the past but with remote sites and their use of Voice gateways before and experienced some of the same issues. 

    Also...

    If these vlans are solely for voice traffic you may want to try the big hammer approach which is bypassing stateful firewall inspection between the PBX and voice networks.  If this works, it could be quite possible you have asymmetric routing going on inside your network.

    from the console cli  (option  #4 I think) look into bypassing the networks:

    set advanced-firewall bypass-stateful-firewall-config add source_network  YOURVOICENET source_netmask YOURvoice_NETMASK dest_network YOUR_PBXNET dest_netmask YOURPBX_NETMASK  

    and then repeat the rule for the traffic going in the opposite direction.    FROMPBXNET --> VOICENET  . So  you'll have two rules for each set of networks you need to bypass firewall inspection on.

    Give that a try...

    Once again this is the big hammer approach and basically turns off firewall features  for the networks you specify in the rule so that the Sophos is simply routing traffic between those networks - this means you wont see any traffic on those firewall rules you setup in the GUI  after this point. 

    If this works somewhere you have traffic going down the pipe in one direction and coming back a slightly different way (weird route  someplace etc)

    Good Luck!

    -Scott

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