After emailing Voipo support, I did get an answer on this. Basically, I was told that the star commands for the pap2t will be the same as those for the GrandStream, but the are all still in beta. From another thread, the commands listed were:
*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)
RA
You can always try the hookflash then hangup transfer method. (I'm running BYOD, so my test wouldn't necessarily be accurate for provisioned users.) With the first call connected, hookflash over to the "second line", dial the number you'd transfer the call to, then hang up. If transfer is supported, the other calls would be connected. Do you have two other lines you can test it with (like two cell phones)?
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