14.2.4.1. Restrictions of System Features 
The following system features cannot be used by
SIP terminals:
- Exec. / Secr. - SIP terminals cannot be configured as Chese members.
- Keyset functionality - SIP terminals cannot be configured as keysets.
- ACD (automatic callback (CCBS / CCNR))
- Witness Facility - An SIP terminal can only be the passive subscriber for the witness facility.
- Malicious Call Identification/Tracing - A SIP terminal can be traced, but cannot trace a connection itself.
- UFIP devices access system features sending the entire digit string at once. Currently this string is limited at 22 digits. For example, in order to enable “remote call forwarding”, the UFIP user has to dial: <AFWDREM_WABE_CD><src_STNO_#><PIN_src_STNO#><dest_STNO_#> - entire string cannot exceed 22 digits.
- For activating a PIN from an UFIP device, PINNKEY has to be set to YES in the coresponding PERSI/COPIN.
- In case of a feature activation from a SIP device (configured as UFIP subscriber) there is no confirmation on the device display that the feature has been activated.
- No DMC in UFIP-UFIP, in the recording cases.