Sometimes that will happen with certain numbers.
From the BT website:
Are there any situations where Ring Back won't work?
Ring Back is not available on the following types of calls:
- International calls
- Calls to other licensed operator numbers who do not have a Ring Back agreement with BT
- Calls to Direct Dialling In (DDI) and Integrated Switched Digital Network (ISDN) numbers
- Calls made with a BT Chargecard
Murphy was an optimist
Zen FTTC 40/10 + Digital Voice FRITZ!Box 7530
BT technician (Retired)
