[Asterisk-Users] Recommended SIP phones?

[Pieter Claassen]

I am dying here with linphone (not sure if it is crap software or just me 
being an idiot) but out of the box debian installations of two linphones fail 
with a "Got SIP response 415 "Unsupported Media Type" back from 192.168.1.3"

Can anybody recommend a particular SIP soft phone that broadly satisfies the 
following criteria?
1. Run on linux.
2. Simple to use and setup.
3. Is preferably packaged in APT.
4. OSS compliant license.

Any recommendations (or let me know if I am doing something wrong with 
linphone) are welcome.

Thanks
Pieter