Connection Issues |
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If you want to call a regular telephone, you need to use a Gateway. Different phone numbers may require different gateways.
If your host or the host being called is on a private network, VoIP communication is possible only through a Gatekeeper. This is a feature of the H.323 protocol.
If you experience problems in connecting with a remote host, try to check the connection using the ping command in the shell prompt.
The ping command can also be used to check communication delay with the host being called. Reasonable roundtrip time should be 100-200 ms for a dedicated and 200-300 ms for dial-up connection. The delay should vary within 10% of average connection delay. If the delays are unexpectedly long, contact your Internet provider or system administrator.
If the number of out-of-order packets is large, your network is overloaded or unstable. Congestion in packet switched networks can cause packets to take different routes to reach the same destination. Packets may arrive in different order resulting in garbled speech. To prevent this, SJphone stores received packets in a special buffer and reorders them. That is why even large number of out-of-order packets does not always deteriorate sound quality if the packets arrive within a certain time. If a packet comes too late, it gets lost.
If the problem persists, contact SJ Labs technical support.