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VOIP over site to site VPN

ViciousMagician1116

Im having the no audio issue with a Shoretel IP phone.  The server is located in head office behind a 210 and the phone is remote behind an 85w.  They are connected via ipsec site to site VPN.  Everything is good with the VPN.  The phone will connect and get dial tone just fine but no audio on a call.  I cant find anything in the firewall logs being blocked for the phone.  IPS isn't even applied to the firewall rules

 

Where else to look? 



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    Check out my response to someone with a slightly different problem than yours in this thread.  (Try the other  suggestions from the other forum members first , but if that failed to fix it  give this a shot) --> https://community.sophos.com/products/xg-firewall/f/network-and-routing/102475/red-keepalive-options-for-voip   

    With the command referenced in the link (my second response) you will be bypassing stateful packet inspection for the phone networks at your HQ and your remote office.

    I'm guessing the initials call rings because it's a simple sip connection between your PBX and your deskphone at the remote site,  but after call setup the phones will then try directly talking to each other (make sure you have firewalls rules in place for each phone subnet on either side.)

     

    -Scott

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    Check out my response to someone with a slightly different problem than yours in this thread.  (Try the other  suggestions from the other forum members first , but if that failed to fix it  give this a shot) --> https://community.sophos.com/products/xg-firewall/f/network-and-routing/102475/red-keepalive-options-for-voip   

    With the command referenced in the link (my second response) you will be bypassing stateful packet inspection for the phone networks at your HQ and your remote office.

    I'm guessing the initials call rings because it's a simple sip connection between your PBX and your deskphone at the remote site,  but after call setup the phones will then try directly talking to each other (make sure you have firewalls rules in place for each phone subnet on either side.)

     

    -Scott

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