This is one of the handover messages, logged with a CCITT7 link monitor, that he saw:
13:54:46"3 4Rx< SCCP 12-2-09-1 12-2-04-0 13 CR
BSSM HOREQ
BSSMAP GSM 08.08 Rev 3.9.2 (BSSM) HaNDover REQuest (HOREQ)
———-0 Discrimination bit D BSSMAP
0000000- Filler
00101011 Message Length 43
00010000 Message Type 0x10
Channel Type
00001011 IE Name Channel type