Recording incoming to extarnal calls in same audio-file

Hi Team, Good day to all!
Present time. Incoming calls.
Customer - inb route - ivr - queue - agent (2xxx) - Talk Customer with agent (2xxx) - transfer call through SIP Trunk - to external PBX agent (4xxxx) - Talk Customer with external PBX agent (4xxxx)
Call ends - we got 2 audio files:
First file - Talk record Customer with agent (2xxx)
Second file - Talk record Customer with external agent (4xxxx)
We need:
Single audio file with all talk. (Merge 2 audio-records in same file)
It possible? How we can do it?

Thanks.

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