jiml@SF

yes it can be done, the problems that everyone are experiencing are actually due to avayas software development. I have found that they are using a proprietary h323 format, this format has its own issues mainly because it is using the udp protocol instead of tcp like all other voice over. This is why if you reboot a switch that ip phones are branched out registered phone become unregistered and will display the extension is already in use error. Avaya is aware of this and as of not will not be coming out with a patch, avayas tech support points the blame at ipv4 stack. I find this quite hilarious being that a 30 year old plus protocol works perfectly fine with the normal h.323 standard and sip. Apperently avaya thinks that they are unique and standards should be bent for them. Now , as far as the vpn goes the pix is the only out of the box supported vpn gateway, junipers netsreen requires a patch to load on top of the firmware to work with avayas ip voice. Being that all the problems i have run into one way or the other with the ip office, i would highly recomend not using it as a vpn endpoint, i would use 2 pixs, and add the routes on to the ip office. Hope that helps.