Maximum Latency between publisher n subscriber for WAN clustering

[Joel George]

Hi.. For a CUCM 9.1 version.. We are planning to add another Sub to the cluster over WAN.. What is the Maximum Latency permitted between publisher n subscriber as per Cisco best practice.. Really appreciate your response.. Regards Joel

[Aman Soi · Accepted solution]

Hi Joel,

The RTT must not exceed 80ms for clustering over WAN.

yuo can also refer SRND.

regds,

aman

[Vivek Batra · Accepted solution]

Please refer the topic Clustering over the IP WAN;

http://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cucm/srnd/8x/uc8x/models.html#wp1043996

[collinks2]

Hello,I know this is an old post. My question is similar to this. On cucm clusters over ip wan,is there other way we can achieve it without vpn.
I know of expressway c and e which are mainly used for MRA,B2B and Jabber guest sessions. I want to ask if expressway c and e can be used to deploy cucm cluster over ip wan without VPN

[Jaime Valencia]

No

[collinks2]

Thanks. Can the vpn feature in the cucm be useful to link two cucm over ip
wan? If yes, is it better than site to site vpn ?

[Jaime Valencia]

That's a PHONE VPN you're talking about, from phones to CUCM. 

[collinks2]

Ok. Thanks