Silent Audio Calls

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

Hi Scott , I have done as you suggested (Set BypassFirewall) and the problem still persists. for testing purposes when  I return the initial cyberoam firewall that was in place it works perfectly something is really not making sense here.

Hi Scott , I have done as you suggested (Set BypassFirewall) and the problem still persists. for testing purposes when  I return the initial cyberoam firewall that was in place it works perfectly something is really not making sense here.