Yealink VoIP SSL VPN Capabilities

Question

I have been testing a Yealink T21 phone which incorporates settings for OpenVPN SSL in its firmware.

If I can connect a phone to the UTMs SSLVPN it would simplify connections from dynamic addresses.  I would no longer need to worry about managing SIP and RTP ports for dynamic addresses as they would all be tunneled.

Has anyone been successful in getting a Yealink to connect to the UTM SSL VPN?  One issue I have is with managing user name and password, which it seems I need passed by the phone.

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Tumelo Lathane · Answer

Gents, I managed to get the yealink T21P E2 to work with sophos VPN(SSL). 
 see below the config file(vpn.cnf) the order of must be exactly as per below 
 client dev tun proto tcp remote xxx.xxx.xxx.xxx 443 tls-remote "/C=za/L=JHB/O=Company Name/CN=me.domain/emailAddress=me@domain.com" route remote_host 255.255.255.255 net_gateway resolv-retry infinite nobind persist-key persist-tun ca /config/openvpn/keys/ca.crt cert /config/openvpn/keys/client1.crt key /config/openvpn/keys/client1.key auth-user-pass /config/openvpn/keys/auth.cfg cipher AES-128-CBC auth MD5 comp-lzo route-delay 4 verb 3 reneg-sec 0