Developer at a tech company with 51-200 employees
More Reliable Unified Communication System
What is most valuable?
• More reliable than other unified communication devices.
• Lower cost of ownership.
• It extends the video capability to your workers during a single, unified communications infrastructure from the desktop to teleprocessing rooms.
• Interoperability and standards support.
• It is scalable for up to 40,000 users.
• It can be extensible to 80,000 users.
What needs improvement?
• One of the major flaws in the unified CM is handling the configuration of the Voice mail port.
• Failure of higher call-control utilities such as transmit recall.
• Failure of higher directory searching and call on utilities.
What other advice do I have?
I have work on Cisco Unified Communication Manager (Call Manager) for one and a half years and it is a remarkable device which provides fully integrated communications, converging voice, video, and data over a single network infrastructure using standard protocols.
Disclosure: My company does not have a business relationship with this vendor other than being a customer.


Buyer's Guide
Download our free Cisco Unified Communications Report and get advice and tips from experienced pros
sharing their opinions.
Updated: October 2025
Popular Comparisons
3CX Live Chat
Fortinet FortiVoice
Kamailio SIP Server
Digium Asterisk
Cisco Jabber
Mitel Application Suite
NEC UNIVERGE Sphericall
Mitel Communications Director
Alcatel-Lucent OmniPCX Enterprise Communication Server
Digium Switchvox
Aastra MX-One
Mitel MiVoice 5000
Buyer's Guide
Download our free Cisco Unified Communications Report and get advice and tips from experienced pros
sharing their opinions.