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By fudging around I got one Cisco phone to work externally.  I am not sure what we did
is the optimal thing to do however, and was hoping to elicit comments/suggestions.
By the way our router software was a bit different than someone suggested but SIP was
turned on.

We had a network (I am using these numbers as an example.  The first 3 bytes may not correspond exactly
to our network.  The last should.

We had a rang 20.30.40.137 - 20.30.40.142.  In the LAN configuration it said the gateway was 20.30.40.137 and
for the WAN 20.30.40.142.  Our SIP phone was 20.30.40.138.  Anyway, the SIP phone wouldn't register, so I

     On the SIP phone set gateway to 20.30.40.137
     On the router set NAT IP Passthrough
and since 138 was not getting traffic, I

     Also on the router set an IPMAP from 138 (internal) to 137 (external).

This allowed the SIP phone to register at two different proxies (two different lines).  On the first proxy everything worked
fine.  AT the second proxy it was using 20.30.40.142 rather than 20.30.40.137 but I could not do two maps for 138.  Simply
doing 142 instead of 137 did not work for either line.

Any idea what's going on?  Should the SIP IP be 20.30.40.137?  Is it OK to do the IP Map?  The NAT ?

Tony

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