Troubleshooting; The Phone Is Failed To Register To Sip Server; The Phone Is Failed To Gain Ip Address; Only One Party Can Hear From Another On Calling - ATCOM A21 User Manual

A2X(W)/A20LTE IP Phone User Manual

8. Troubleshooting

8.1. The phone is failed to register to SIP server

1. First of all, check the IP address. If the LAN port is DHCP, please ensure the DHCP server
has been enabled.
2. Check the network gateway
3. Check the DNS
4. Make sure the input account matched the one provided by Service Provider
5. Make sure SIP Server has been enabled already
6. Make sure the Port of SIP Server, it's 5060 by default

8.2. The phone is failed to gain IP address

1. Make sure the network cable has been plugged into the LAN port
2. Make sure the network cable or port of network switch are working fine,
3. Make sure the DHCP server has been enabled, and there are available IP address
4. Try to set the LAN port as Statics IP

8.3. Only one party can hear from another on calling

1. Try to make a IP peer to peer call, to make sure the mic and speaker are working fine
2. Enable STUN via Web
3. Set the address of STUN Server, for example stun.sipgate.com
4. Present this operation above and the phone will be reboot
5. Try to make a normal call again
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