<html>By fudging around I got one Cisco phone to work externally. I am not sure what we did<br>is the optimal thing to do however, and was hoping to elicit comments/suggestions.<br>By the way our router software was a bit different than someone suggested but SIP was<br>turned on.<br><br>We had a network (I am using these numbers as an example. The first 3 bytes may not correspond exactly<br>to our network. The last should.<br><br>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<br>for the WAN 20.30.40.142. Our SIP phone was 20.30.40.138. Anyway, the SIP phone wouldn't register, so I<br><br> On the SIP phone set gateway to 20.30.40.137<br> On the router set NAT IP Passthrough<br>and since 138 was not getting traffic, I<br><br> Also on the router set an IPMAP from 138 (internal) to 137 (external).<br><br>This allowed the SIP phone to register at two different proxies (two different lines). On the first proxy everything worked<br>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<br>doing 142 instead of 137 did not work for either line.<br><br>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 ?<br><br>Tony<br>
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