Connection delay

[vdvandyshev]

I noticed the following phenomenon: sometimes after establishing a connection, there is no audibility for 6-7 seconds. I made control sets from 2100 to 3100. Managed to make CTDEI, SUSIP printouts.
<CTDEI: DIR = 2100;
CALL TRACE
INITIATED ON DIR: 2100 EQU: 002-3-70-24
DEVICE TYPE EL6 PTR: H'025B
MP-IN EQU MP-OUT EQU DEV EQU DEV DIR EQU

NOT ACCEPTED
HELP DEVICE TRACED
<SUSIP: DIR = 2100;
STATUS INFORMATION AT 08:27:39 15SEP21
DIR TYPE TRAFFIC STATE / PTR LINE STATE / PTR DIV STATE ADD INFO
2100 ATS SPEECH # 025B BUSY # 022E
END

Printouts above - no sound
Printout below - the sound has appeared.

<CTDEI: DIR = 2100;
CALL TRACE
INITIATED ON DIR: 2100 EQU: 002-3-70-24
DEVICE TYPE EL6 PTR: H'025B
MP-IN EQU MP-OUT EQU DEV EQU DEV DIR EQU

L> GS 002-0-00-01 GS> L 001-2-00-04
KL1 3100 001-0-30-12
EXECUTED
Help me, please!!!