Sonictel Extensions 700 series with leading digit 7

Extensions starting with 7 are not permitted on the platform as it interferes with the programming for the transfer to voicemail option 7+[EXT] 

If necessary a ticket can be opened to change the voicemail transfer to use a different number than 7

Below is an example:

Hi Team, 

I need the transfer to voicemail option changed from 7 to 6, so I can use the 7xx and 7xxx range for extension.

Thank you,

Sonictel