Cisco Support Community
Showing results for 
Search instead for 
Did you mean: 

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

VoIp setup over satellite

Hi All,


I have the following setup, 50 remote users are connected to HQ by satellite links (delay about 600 ms), each remote has 2 IP Phone where they are calling HQ.

I  don't have the option to add router(CM) for the remote can i use SIP protocol for such network with high delay

your suggestions are most welcome  



Everyone's tags (1)
Cisco Employee

As per the SRND, " If a voice

As per the SRND, " If a voice service is hosted across a WAN where the one-way latency is 200 ms, for example, users might experience issues such as delay-to-dialtone or increased media cut-through delays. For other services such as presence, there might be no problem with a 200 ms latency." So, a delay of 600 ms will not provide a good user experience.



New Member

Thanks Manish for your

Thanks Manish for your response.

I understood the issue of have two CM servers talking to each other though high latency link.

i am wondering about the performance of call setup for SIP phone through such links; since the phone should communicate with SIP server during  call setup and ending.






One of my customers has a

One of my customers has a remote site with a response time of 240ms.

Originally we installed CUBE for PSTN breakout at the remote site but the MTP was using the resources on the CUCM and users were reporting very poor call quality and delaying in the phone operations.

We installed a Subscriber server on the remote site and reconfigured the CUBE to use the local subscriber server. Which works fine.

As Manish suggested 600ms will not give a good user experience if it even works at all!

Good luck!