IP Office IP500 Professional Upgrade
Features Include:

• IP500 Pro Upgrade has the capability to expand the IP500 using up to 8 external expansion cards. The IP500 will then allow support for a maximum of 272 phones using a mix of digital, analog or IP phones.
• IP500 Professional gives support for more analog trunks by using the analog trunk 16 expansion module.
• It also enables licensing of advanced applications like Voicemail Pro, CCC and more
• 3 Year Warranty