How to remove a number from the chain on Siemens HiPath 4000 PBX?

Question

Telephony

Good afternoon!
Please tell me how to remove the number from the chain on Siemens HiPath 4000 PBX?
inherited from another team of workers.
The PBX has settings, there is a group of internal numbers, the call goes in order (2 beeps, switching to another in the chain, etc.), and so it became necessary to remove one number from the chain and make it separate (single and direct)