I started out with a PAP2T for about a year or so with Voipo but when the 2nd line port died and was replaced with the Grandstream HT502 my service reliability went way up. My PAP2T would reboot in the middle of calls causing the call to drop, some calls would go directly to voicemail without ringing and a lot of times the call would drop after attempting to pick them up while ringing..

The HT502 has been rock solid and I've had zero issues with dropped calls or any other problems since I received it.