I used this for a week for testing when I thought my ATA had given up but it turns out my internet was disconnecting.
Now surplus to requirements.
In brand-new perfect working condition.

$40.  Pickup available in Palmerston North or I can courier for $5.

http://www.grandstream.com/products/ht_series/ht701/marketing/ht701_brochure_english.pdf 

HT701 is a next generation, powerful IP ATA (analog telephone adapter) for residential and road warriors. Its ultra-compact size, superb voice quality, rich functionalities, strong security protection, excellent manageability and auto provisioning, as well as unrivaled affordability enable service providers to offer high quality IP service at extremely competitive price. The HT701 is an ideal single-port ATA for large scale commercial IP voice service deployment. 

Single FXS telephone port(supporting 5 REN) single 10/100M Ethernet port 
LEDs for Power, Internet, LINK/ACT, and Phone status 
Strong security protection of voice/data privacy using TLS/SRTP/HTTPS, secure and automated provisioning using TR069 and HTTP/HTTPS/TFTP