Hi Saurabh,
Could you please give me the below details
1. When was the CUA set-upped ?
2. Before its was working fine ?
3. Let me know SCUM setting option what you have selected for Telephone number.
4. is there any new changes you have done in the CUA settings recent days?
5. Check the status of Child systems in SCUA
Sorry to ask all this . based on this we will get some clue
Regards
Kiran.S