Element,Description,Reference
"""T33S""","The ITU T.30/T.33 subaddresses            
(facsimile service)",[RFC3192]
"""ISUB""",The optional ISDN sub-address,[RFC2846]
"""POSTD""","The optional further dialing sequence     
needed to access addional services (for
example a menu' driven interface)",[RFC2846]
"""ATTN""","The personal name of the individual       
(origin to or recipient)",[RFC2846]
"""SYSNUM""","To specify the numeric optional AMIS      
sub-address element as described in
""VPIM Addressing"", [RFC3804]",[RFC3804]
"""EXT""","To specify the numeric optional           
extension that identifies a particular
VPIM mailbox as described in ""VPIM
Addressing"", [RFC3804]",[RFC3804]
"""DL""","To specify the numeric optional personal  
Distribution list for a particular VPIM
mailbox as described in ""VPIM Addressing"",
[RFC3804]",[RFC3804]