# RTU dials out, but will not answer incoming calls

- Check configured ring delay by pressing PROGRAM 40 4 ENTER.
- If it is set for a number larger than one (1), the RTU is not supposed to answer until the corresponding number of rings has been received.
- Try setting it back to one (1) by using code 40 4 ** ENTER.
- If the RTU still will not answer incoming calls but is able to dial out, try plugging a regular telephone into the same phone jack in place of the RTU and see if it rings.