What to do when a Salesperson moves on?

It is inevitable that sales staff will move on, either voluntarily or by being fired but how do you stop customers calling the rep direct on their mobile once they are gone?

It is common practice to issue a work mobile but then how do you know what is said on calls between mobiles and customers or suppliers?

Modern telecom system are able to fully mesh and integrate with SIM cards such that a call made to or from the SIM goes via the telephone system. This allows for call recording, real time monitoring and the full range of call handling features to be applied. Outbound calls can present either the mobile number or a landline as appropriate. Better yet, using the basic 2G signal which is used for voice means the issues of VoIP apps which need a solid 4G signal to work and can get flaky at exactly the wrong moment, disappear at a stroke. The holy grail of integrating and controlling this area of your comms is finally here.