In this type of incidence may be several factors, please follow the following recommendations.
- Check available balance in case of outgoing calls:
Validate your balance in credits available for calls on the following link.
- Check connecition status:
Verify that the phone is correctly connected to the network and that it is receiving a valid local IP within the network, This information will usually be found on your phone screen depending on the model.
If you do not receive a valid IP, you should contact your network administrator, In case of receiving a valid IP please proceed with the following instructions.
Validate the quality of the connection, see the following link.
- Change network protocol on the phone.
Change the network protocol or transport type from UDP to TCP or from TCP to UPD depending on which had the phone configurated previously.
- Check for firewall blocking ports.
Make sure the following ports are open in your router's firewall.
Port 5060 TCP y UDP For the called messaging SIP
Ports UDP 16384: 32768 to allow traffic RTP for audios stream.
After making the above recommendations and do not get favorable result please open a support case here or to the mail firstname.lastname@example.org