Showing results for 
Search instead for 
Did you mean: 

Cisco CUCM Network Requirements


Hi all,

customer wants to know all requirements regarding Network for a CUCM Environment. In SRND there is the following information:

Unified Communications and Collaboration over an IP network places strict requirements on IP packet

loss, packet delay, and delay variation (or jitter).

But I can`t find a complete overview of all requirements that need to be met. So max. packet loss, delay, etc. Is there anything available?



2 Replies 2

Vaijanath Sonvane
VIP Advocate VIP Advocate
VIP Advocate

Hi Juergen,

Take a look at the below URL and search for "WAN Considerations". This link provides all the details that you need.


Vaijanath S

Please rate helpful posts and if applicable mark "Accept as a Solution".
Thanks, Vaijanath S.

Jaime Valencia
Hall of Fame Cisco Employee Hall of Fame Cisco Employee
Hall of Fame Cisco Employee

Delay in IP Voice Networks

Recommendation G.114 of the International Telecommunication Union (ITU) states that the one-way delay in a voice network should be less than or equal to 150 milliseconds. It is important to keep this in mind when implementing low-speed WAN links within a network. Topologies, technologies, and physical distance should be considered for WAN links so that one-way delay is kept at or below this 150-millisecond recommendation. Implementing a VoIP network where the one-way delay exceeds 150 milliseconds introduces issues not only with the quality of the voice call but also with call setup and media cut-through times because several call signaling messages need to be exchanged between each device and the call processing application in order to establish the call.

Above from the same chapter Vaijanath mentioned, if you're looking for BW requirements around clustering, the Collaboration Deployment Models cover that info. If you're looking for audio/video BW requirements, the Network Infrastructure chapter also cover the topic.



if this helps, please rate
Getting Started

Find answers to your questions by entering keywords or phrases in the Search bar above. New here? Use these resources to familiarize yourself with the community:

Recognize Your Peers