Are there any development ideas or related service providers for call transfer?

currently receives a request for a virtual call. The details are

.

An and B talk, but the middle number C is displayed on the mobile phone screen through the intermediate numbers CMagia An and B.

is to establish a binding relationship between number An and number B and intermediate number C through the code, and then number A dials the intermediate number C Magi An and B to make a call, and the incoming call shown by B is also the intermediate number C.

MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1b38202-2b867.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1b38202-2b867.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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