On 2/17/11 9:18 AM, Bruce Goldstein wrote:
Which IP phones have you had the most success with when the
phone is behind a firewall?
I tried every combination I could think of, even some that needed
'hacking' (putting into SIPDEFAULT.cnf)
nat on, nat off, one to one on, one to one off. never got it to work.
and, I don't know anyone on this list who will tell you they got cisco
7960's to work in a remote setting.
ever thought of vpn between the two? you can use something like openvpn,
without encryption, without compression. might not muck up the packet
too much.
I think the polycom's might be your best bet for remote phones.
however.. there is an issue MIXING polycom's with cisco.
the cisco phone cannot make an attended transfer to a polycom phone.
it can make a blind transfer.
and, in default configuration, you can 'conference' in the third party
and then drop out of the call.
and you still have the 'natting' issues to contend with. must use one
to one port mapping, must turn off 'sip helpers'. can't use stun servers.
--
Michael Scheidell, CTO
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