dpkg -l | grep asterisk
ii  asterisk                         1.2.13~dfsg-2                   Open Source Private Branch Exchange (PBX)
ii  asterisk-classic                 1.2.13~dfsg-2                   Open Source Private Branch Exchange (PBX) - 
ii  asterisk-config                  1.2.13~dfsg-2                   config files for asterisk
ii  asterisk-prompt-es-co            0.20061027-1                    Colombian Spanish voice prompts for Asterisk
ii  asterisk-sounds-extra            1.2.1-1                         Additional sound files for the Asterisk PBX
ii  asterisk-sounds-main             1.2.13~dfsg-2                   sound files for asterisk
ii  asterisk-web-vmail               1.2.13~dfsg-2                   Web-based (CGI) voice mail interface for Ast