Hello I have looked at the blogs to see if I could autoprovision the DP715 to be a remote extension, but under the Phone Provisioning options I can only see the 'Local LAN (in the office)' option while other grandstream models such as the GXP series offer both NAT mode and SIP proxy mode. Without this option, it seems I will need to manually configure the DP715 to use the sip proxy tunnel like I have done for 2 of the Yealinks which are already working on the remote network. However, it seems I can't get this dect phone to register! These are the settings I have changed from the default on the DP715: Primary SIP server- 192.168.1.4 (local IP of the pbx) Outbound Proxy- 192.168.1.67:5085 (local IP and listening port of the SIP proxy manager) User/ID/password- all set and triple checked to be the correct credentials for the extension Name- Profile shop (same as name on extension) Mis. settings- SIP registration/unregistration on reboot set to 'yes,' outgoing call without registration set to 'no' I have been monitoring the server event log to look for failed registrations and the IP blacklist to see if I put in the authentication details wrong (I have a strict anti-hacking setup), but there were no relevant public or private IP's which leads me to believe that something has gone wrong between the DP715 and the SIP proxy manager (although 2 yealink hand sets work fine using the proxy). Is there anything obvious that I'm not seeing here? Thanks in advance!