Auto provisioning + Telstra router

[Glen.c]

So as of last week Telstra (major ISP in Australia) rolled out an update to their ISP supplied routers and now each time a yealink phone attempts to auto provision behind these routers the server URL field in the yealink is being auto populated with Telstra provisioning link to their sip service. The phone then begins asking clients for their telstra auto provisioning credentials.

What am i turning off in the Telstra router to make this behaviour stop and stop that server URL field being populated by the Telstra URL?

 

[Evolute IT]

Check for DHCP Option 66.

 

[JohnS_3CX]

Sounds like their either implemented Option 66, or those phones were added into Yealink's RPS