Why it happens
- Missing digits, an extra trunk prefix (8 or 0), or no country code where one is required.
What to check
- Normalise numbers on outgoing routes to the format your carrier wants, usually +E.164.
Q.850 cause 28: Invalid number format (address incomplete)
Invalid number format: the number is incomplete or written in a format the network does not accept.
28
- Q.850 name
- Invalid number format (address incomplete)
- Group
- Normal events
- FreeSWITCH
- INVALID_NUMBER_FORMAT
- Asterisk
- HANGUPCAUSE=28
- SIP response from a gateway
- 484 Address Incomplete
- Produced from SIP codes
- 484
- In SIP
- Reason: Q.850;cause=28