Prehistory: I have over 15 of SNOM 720 and 760 phones on my IT sector, but not so long ago one of them needed to be replaced and I purchased new D725 which I was told is going to be replacement model for 720.
So, I've updated device to the latest firmware and patched it with VPN addition patch for the VPN support is crucial for our IP telephony to work as they connecting via it to the network where 3CX PBX resides.
Main issue is: when I telling phone to load VPN .tar archive it's loading archive and rebooting to activate. And after that it's acting up. Label "SNOM725-SIP-8.7.XXX" changing with "Starting phone application" still persist even when phone boot complete. Phone restarting at it's own will and could not handle calls, bootloops are also happen often. here is the VPN config that worked perfectly on 720 and 760:
remote 95.XXX.XXX.XXX 1194 udp
Are you able to configure and setup a network Syslog Server and possibly a Netcat Server in order to capture the logs from the phone so we can determine what is happening?
Network Syslog Setup
1. Login to webinterface
2. Select Log
3. Configure the log level to 9
4. Download and install a Syslog Server to a local PC (https://github.com/MaxBelkov/visualsyslog)
5. Select Advanced > Network > at the bottom of the screen enter the ip address of the PC hosting the Syslog Server
6. Replicate the problem
7. Attach the file to the ticket
Is this Syslog from a Snom D715? Is there anything connected to the USB port?
It seems like you may be experiencing a known "restating application" issue that occurs when/if vpn_netcatserver is misconfigured or configured and the netcat server is not responding.
The work-around is to remove any reference to a netcat server in this seting if it is not being used to debug a VPN connection. If you do have to use it to debug the VPN, it is suggested to remove the netcat server because credentials for the OpenVPN connection are captured in the netcat log.
Another thing you will want to do is make sure the timing on the OpenVPN Server and the phone are in sync by using NTP at both locations.
Please give this a try and let us know if the application restarting is still occurring.
Glad to hear it's working for you now.