Hi, we have had a long standing “issue” with Grandstream phones and openVPN (we had many months of testing with Watchguard Firewalls (has an openVPN server in it) and the phones, and we have them working, with that in mind, it appears there are some settings missing in the openVPN config that freePBX downloads for the endpoint device.
Need to know the below:
- Cipher method
- Authentication encryption method
It appears the phone connections then the openVPN dumps the connection, which normally happens over password authentication methods (effected by both of the above settings), so if anyone has managed to get Grandstream GXP21xx phones working on VPN, what settings did you use?