B# have CFNR authority which forward the call to C# when B number did not answer the phone. But the CFNR feature did not function.
MOD SBR to modify the Duration of no response value to default value which is 20 seconds: MOD SBR:IMPU="sip:+firstname.lastname@example.org",NOAT=20;
Notes: Some terminal need small interval to identify the caller didn't answer the call. So, we reduce the timer to 20 sec.
1. Check B# call authority and barring group (LMTGRP) by running command LST SBR in SPG-ATS. B# has the authority to call C# and barring group is normal.
2. Check if B# has parked as owe subscriber by running command LST OWSBR. B# status is normal.
3. Check B# supplementary service by running LST SS and DSP CFNR to check the configuration. 4. If everything are normal and correct, LST SBR again. Check Duration of no response value and found that the value has been set to 40 seconds.
Duration of no response: It specifies the interval during which the caller does not answer the call for the Call Forwarding No Reply (CFNR) service. Unit: second