A.VOWIFI

B.VOLTE

C.SVLTE

D.CSFB

E.OTT

A.HSS

B.I-CSCF

C.S-CSCF

D.P-CSCF

A.STN-SR

B.C-MSISDN

C.ATU-STI

D.MSI SDN

A.Excessive mechanical downtilt angle will cause the antenna to filter back and back, which will damage the antenna for a long time.

B.The mechanical downturn will cause the back flap of the antenna to be upturned, causing interference to the neighboring area, causing the mobile phone of the higher layer of the neighboring area to drop the call.

C.Excessive mechanical downtilt angle can also cause beam distortion to generate new interference

D.The mechanical downturn will cause the back flap of the antenna to be upturned, causing interference to the neighboring area, causing the mobile phone of the lower layer of the neighboring area to drop the call.

A.False

B.True