Beta Feature: Star Codes

[VOIPoTim]

We've added a few Vertical Service Codes/Star Codes which are ready to be tested.

*20 [phone_number] - Call Forward
*21 - Call Forward Disable

*22 - DND Busy
*23 - DND - Voicemail
*24 - DND Disable

*25 [phone_number] - Set Failover Number
*26 - Set Failover to Voicemail

*69 - Return Last Call
*27 - Add Last Caller to Blacklist

*67 - Block Caller ID (Single Call)
*30 - Block Caller ID (All Calls)
*31 - Unblock Caller ID (All Calls)
*82 [phone number] - Send Caller ID (Single Call)

These should be fine, but please report any issues with them here. All numbers currently need to be in 10 digits.

The reason some of the codes are not in the traditional numbering is that the HT502 intercepts some of them when we use the traditional numbering.