Are Avaya 5420 phones compatible with Sonicwall TZ 215?

We have 3 remote users that are using VPN phones.  Someone told me the 5420s are only compatible with Cisco firewalls.  That doesn't sound right to me though.  Can anyone offer any insight on this?  I was going to upgrade the firewall from Cisco ASA 5505 to Sonicwall TZ 215.
tchristmanAsked:
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Blue Street TechLast KnightCommented:
Any updates on this?
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orlandotommyCommented:
link is dead.
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