Although you can send other Connections to the same voicemail by simply configuring a Call Flow on them, you may prefer to have a dedicated SIP URI that accepts anySIP To value (SIP user), even those without a corresponding Connection
With elastic SIP Trunking you can create a shared voicemail
Use Case
Send call with any SIP To header to single, shared voicemail
Create a Trunk. Select a name and SIP URI (see Trunk) for SIP input type (you can enable PSTN input too and you can also keep it PSTN-only but that can't multiplex SIP users)
You will likely leave Trunk OUT section of your Trunk disabled. In some more specialised scenarios you may enable it to send call further: to PSTN, mobile number or to another SIP URI
✅ You now have created a SIP Trunk with a flow that will accept call with any SIP To header and send them all to voicemail