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Sonicwall Blocking VOIP SIP Services

Posted on 2008-10-17
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Last Modified: 2012-06-21
I have a Sonicwall 2040 and I also have a linksys spa 3102 and 2102 voip ata setup configured to be point to point so it is basically bridging the phone line across the country to our california office through the vpn. So far I have been successful in configuring the linksys products with a standard switch and it works great but as soon as I attach it to our corporate network the sonicwall shuts it down and all I get is a busy signal. I guess a lot of people have this problem and I haven't found anything useful in my hours of searching google, etc.

Any help would greatly be appreciated. Thanks
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Question by:gsco
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ozoid earned 500 total points
ID: 22747351
Hi - the problem may one of many things - as you are trying to send voice via the VPN connection - you may find that the packet size (MTU) of the voice information is too large, VPN will encapsulate the voice packets and therefore take up some space at the front and rear of the packet - if your voice server/phone uses the normal packet size of 1500 then all your packets will have to be fragmented to fit inside the VPN packets - try setting your voip server/phone to a smaller MTU ~1400.
Sonicwalls are a pain for Voip and some of them have an extra tickbox hidden away or a complete menu of their own. dont forget you will also have firewall rules that apply across the VPN and your voip ports will need to be opened.
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Author Comment

by:gsco
ID: 22764466
Well I figured it out. For some reason the sonicwall appliance does not want you to assign a static address on the sip device. So I set it to dhcp and then created a static entry in the sonicwall gui itself and it was basically "plug-and-talk"
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Author Closing Comment

by:gsco
ID: 31512229
You tried to help so I think points should still be awarded
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