Why does telephony not work when connected to a VPN?

Question

Telephony

Hello!
When creating a VPN connection directly (without a router), telephony (3cx phone) works. It does not want to work with the router, but the ip is used by the vpn of the server, the Internet is working. The tp-link wr740n router itself does not know how to raise a VPN connection, but it can redirect an already created connection to Windows.
I use Windows 10 system.
Tell me how to solve this problem and how to implement it.
This is when connected directly:

C:***>ipconfig /all
Windows IP Configuration
Host Name . . . . . . . . . . . . : asus
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Hybrid
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
Wireless LAN adapter Local Area Connection* 10:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Hosted Network Virtual Adapter
Physical Address. . . . . . . . . : 56-DB-30-1E-79-1F
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Wireless LAN adapter Local Area Connection* 11:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Wi-Fi Direct Virtual Adapter
Physical Address. . . . . . . . . : 16-DB-30-1E-79-1F
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Ethernet adapter Ethernet:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Realtek PCIe FE Family Controller
Physical Address. . . . . . . . . : D8-50-E6-A0-1B-EF
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . :Yes
Link-local IPv6 Address . . . . . : fe80::296f:6599:2e22:66c0%2(Preferred)
IPv4 Address. . . . . . . . . . . : 93.72.153.0(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.240.0
Lease Obtained. . . . . . . . . . : December 17, 2015 08:11:06
Lease Expires . . . . . . . . . . : December 17, 2015 11:11:06
Default Gateway . . . . . . . . . : 93.72.144.1
DHCP Server . . . . . . . . . . . : 82.144.192.41
DHCPv6 IAID . . . . . . . . . . . : 81285350
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-19-DA-27-72-A4-DB-30-1E-79-1F
DNS Servers . . . . . . . . . . . : 82.144.192.130
82.144.192.131
NetBIOS over Tcpip. . . . . . . . : Disabled
PPP adapter vpn:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : vpn
Physical Address. . . . . . . . . :
DHCP enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv4 Address. . . . . . . . . . . : 192.168.0.89(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.255
Default Gateway . . . . . . . . . : 0.0.0.0
DNS Servers . . . . . . . . . . . : 192.168.0.1
NetBIOS over Tcpip. . . . . . . . : Enabled
Wireless LAN adapter Wi-Fi:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Qualcomm Atheros AR9485 Wireless Network Ada
pter
Physical Address. . . . . . . . . : A4-DB-30-1E-79-1F
DHCP Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
Link-local IPv6 Address . . . . . : fe80::bc3d:c5da:30d0:cb3a%4(Preferred)
IPv4 Address. . . . . . . . . . . : 192.168.1.100(Preferred)
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Lease Obtained. . . . . . . . . . : December 17, 2015 09:09:28
Lease Expires . . . . . . . . . . : December 17, 2015 11:09:26
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DHCPv6IAID. . . . . . . . . . . : 262462256
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-19-DA-27-72-A4-DB-30-1E-79-1F
DNS Servers . . . . . . . . . . . : 192.168.1.1
NetBIOS over Tcpip. . . . . . . . : Enabled
Tunnel adapter 6TO4 Adapter:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft 6to4 Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2002:5d48:9900::5d48:9900(Preferred)
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 419430400
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-19-DA-27-72-A4-DB-30-1E-79-1F
DNS Servers . . . . . . . . . . . : 82.144.192.130
82.144.192.131
NetBIOS over Tcpip. . . . . . . . : Disabled
Tunnel adapter Teredo Tunneling Pseudo-Interface:
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft Teredo Tunneling Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
IPv6 Address. . . . . . . . . . . : 2001:0:9d38:6ab8:413:fc6:a166:3ec5(Preferred
)
Link-local IPv6 Address . . . . . : fe80::413:fc6:a166:3ec5%8(Preferred)
Default Gateway . . . . . . . . . :
DHCPv6 IAID . . . . . . . . . . . : 335544320
DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-19-DA-27-72-A4-DB-30-1E-79-1F
NetBIOS over Tcpip. . . . . . . . : Disabled
Tunnel adapter isatap.{D27A5B48-FD5C-4BC1-9DE7-8F14E50D22DA}:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter isatap.{5DDDB7EE-628C-45C8-B0C1-3BE1D1ADBF8C}:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #2
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP Enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes
Tunnel adapter isatap.{2A8EF4FF-46A5-485C-B5DC-DE95DF2F093E}:
Media State . . . . . . . . . . . : Media disconnected
Connection-specific DNS Suffix . :
Description . . . . . . . . . . . : Microsoft ISATAP Adapter #3
Physical Address. . . . . . . . . : 00-00-00-00-00-00-00-E0
DHCP enabled. . . . . . . . . . . : No
Autoconfiguration Enabled . . . . : Yes

Answer 1

First answer the questions:
1. Is 3cx phone a software client for Windows? If so, is the name or ip address used as the connection server?
2. VPN to connect to the telephony server?
3. The scheme of work through a router is not clear. What does it mean that he can’t lift, but only forwards? This router in the alternative firmware can do everything if anything.
In short, the essence of the problem is absolutely incomprehensible - you can not lift the VPN? Or can't connect to the telephony server?