Whats a good, cheap, secondhand desktop SIP phone that works well with asterisk and behind NAT?

We just need to buy some phones and of course, we would prefer second hand ones.

I’ve had a Cisco 7960 burning my soul with wired NAT traversal and PJSIP configuration issues so I was just wondering if anyone could recommend a desktop SIP phone with the following characteristics:

  • available on the second hand market,
  • good NAT traversal,
  • good sound quality
  • works well with PJSIP

I am not sure about second hand, but there are many desktop phone which support IAX2 protocol. I tried a few and had no problem with NAT.

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