You will need to contact your voip provider or VoIP System Administrator for more assistance. Any of these would require support on the server side. It is possible to bypass the restrictions by using IAX, TCP/ TLS, non standard ports or VPN tunnels, depending on the way of blocking. Your provider could be filtering or altering the network packets. Other causes for the missing audio issue are: Try different combinations of these settings to achieve better results. If the issue persists, open the Network Settings once again and try enabling or disabling RPORT for media. Your provider might have their own prefferred STUN server. * By default, Zoiper for Android is using. If the issue persists, open the Network Settings again and activate or deactivate STUN*. Try enabling or disabling RPORT for signalling, save the changes and try to make a call. Select Accounts and click on the affected account. In most cases this can be resolved by altering the account configuration. The issues usually appear if the configuration is not adjusted accordingly to the wireless or 3g/4g network. When using SIP protocol one way or missing auido issues mostly appear due to configuration problems.
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