Troubleshooting

SIP Registration

Error 408, 503

Check you have an internet connection available either WiFi or Cellular (3G). If this is OK check you have specified the domain or proxy ( if required) correctly.

Error 401, 403

Check you have entered your username and password correctly. Also if your provider requires that you need to specify an Authorization username, check this is entered correctly.

Dialling

Error 404 when calling

Check you have dialled a valid number or sip uri. Also if you have any dialling rules which are incorrect, the number being dialled may not be what you intended.

Error 488 when calling

If a common set of codecs cannot be negotiated with the remote party, call setup will fail. Try enabling more codecs.

Dialling attempted but call is not established

Try enabling the Global IP or Global IP 3G settings depending on whether you are on WiFi or Cellular (3G) network.

Incoming calls

Not receiving incoming calls in the background

There are two methods to receive calls in the background, either ensure the 'Keep Awake Mode' setting is set to 'Always' in the Preferences menu (this keeps the app running in the background) or in the Advanced SIP settings set the 'Incoming Calls' setting to 'On with Push' (you need to have the 'Keep Awake Mode' setting set to 'Foreground' to use Push notifications).

Not receiving incoming calls in the foreground or background

Try enabling Global IP or Global IP 3G. Make sure you are not registering from multiple devices.

Incoming calls are not reliable

Ensure the UDP Keepalive setting is on, if it is already on, try lowering the interval.

No audio or one-way audio during a call

Try changing the Global IP ( if you are on WiFi) or Global IP 3G ( if you are on Cellular ) setting to 'Off' and the STUN enabled to 'Off'.

If the above does not work, enable STUN and specify a STUN server in the Advanced SIP settings given by your VoIP provider.

Poor audio quality

If calling over cellular (3G) networks, check the codec negotiated in the incall screen. If the codec is G711u or G711a this is probably the cause of the problem as these codecs use too high a bandwidth to allow good audio on 3G. Try disabling both these codecs in the 3G codecs setting in the Advanced SIP menu. Ensure either GSM or iLBC codecs are being used when calling over 3G.

The same problem can be experienced on WiFi if the connection is poor. Again changing to using GSM or iLBC can resolve this.