yes, roughly the same as a softphone, I think the mitel had some issues with some of our packets, try callerid_in_from

<!--/// replace the INVITE from user with the channel's caller-id ///-->
<!--/// this is false by default because outbound calls generally need username in the INVITE ///-->
<param name="caller-id-in-from" value="false"/>

or experiment with other settings from the wiki:

http://wiki.freeswitch.org/wiki/Sofia_Configuration_Files

more info on mitel devices:

http://wiki.freeswitch.org/wiki/Interop_List#Mitel_devices

Mike

On May 3, 2010, at 12:30 PM, Kurt Ward wrote:

Maybe this is a bit of an uneducated noob question (or
misunderstanding about SIP) but here goes:

If I have an external profile set up and registering, does it
essentially behave like a soft phone would behave?

What I am running into is incoming calls work fine, but outgoing calls
always produce a 404. If I use a soft phone using the same
registration I can make calls with no problem (in both scenarios the
calls are to/from 4 digit extensions on a Mitel PBX).