There is a limit on the VM length but you can modify it. This line of the script has a maxLength parameter, represented in seconds: resp.record(maxLength=”30″, action=”/handle-recording”). If you changed that value from 30 to 120, for example, the max VM recording length would be 120 seconds, for example. Note that the voice mail recording is not stored on the Pi; it’s stored on Twilio’s servers, hence the per minute charge from Twilio for the recording and the service. Is it possible to use it as CCF (conditional call forwarding)? after enabling the forwarding option it should play some pre recorded messages on the basis of who calls ?
The first thing your callers should hear is the name of your business or organization. This assures them that they have dialed the right phone number and keeps them on the line. You may also want to include your address if there are multiple companies with the same name.

The importance of voicemail in the customer care sector has not diminished despite the arrival of newer web technologies. VoIP applications let the businesses use voicemail service with flexibility, as it is. The users need not rely on extension terminals when they use VoIP services. A strong internet connection is a prerequisite and the pre-configured phones can be used – both for calling /receiving calls and for automated custom greetings. IVR feature redirect callers to the right virtual extension where their needs can be addressed. This can be done anywhere through a web portal access and an internet connection.
Your carrier offers few options, if at all. But with YouMail, you can choose from three different types of voicemail greetings: Smart Greetings, Personal Greetings, and Pre-Recorded Greetings from the free YouMail Greetings Catalog.You can switch between multiple greetings in an instant or assign different greetings to different callers.