Can I cancel a call transfer

Any of you guys know how to cancel the call transfer in Asterisk. For example: I transfer the call to my colleague by dialing #500. However, he is not in his office and I want to take back the call, how can I do that?
Many thanks in advance for answering my question.

You can try use the attended transfer instead of blind transfer, attended transfer puts on hold the current caller before calling the new party, so if the new party doesn’t answers you are able to talk to the party on hold again, check features.conf for details.

Regards.

Marco Bruni