3 Sites, all Connected VIA VPN

SITE A (172.16.80.9)
SITE B (172.16.2.2)
SITE C (172.16.3.34)

All sites can ping each other perfectly.

Site A <-> Site C - Connects and routes calls fine
Site C <-> Site B - Connects and routes calls fine

Site A <-> Site B - No workies :(

SITE A:
asterisk1*CLI> sip show peers
Name/username              Host            Dyn Nat ACL Port     Status
HWNLH                      172.16.2.2                  5060     Unmonitored
DNMP/DNMP                  172.16.2.2                  5060     UNREACHABLE
DNL/DNL                    172.16.3.34                 5060     OK (41 ms)

SITE B:
asterisk1*CLI> sip show peers
Name/username              Host            Dyn Nat ACL Port     Status
HWNLH                      172.16.80.9                 5060     Unmonitored
DNLDNMP                    172.16.3.34                 5060     Unmonitored
DNMPDNL/DNMPDNL            172.16.3.34                 5060     OK (61 ms)
DNMP/DNMP                  172.16.80.9                 5060     UNREACHABLE

SITE C:
asterisk1*CLI> sip show peers
Name/username              Host            Dyn Nat ACL Port     Status
HWNLH                      172.16.80.9                 5060     Unmonitored
DNMPDNL                    172.16.2.2                  5060     Unmonitored
DNLDNMP/DNLDNMP            172.16.2.2                  5060     OK (62 ms)
DNL/DNL                    172.16.80.9                 5060     OK (30 ms)