one of SBA server MOH not work suddenly.

Check SBA server event log don't have relate MOH error and main site and some SBA servers MOH is work. 

How to trace the problem? Debugging log?

reboot SBA ?  

Gateway didn't have change recently and MOH suppose is play by SBA server right?

Thanks.

• Edited by Jo Tse Monday, July 20, 2015 3:27 AM subject

but outbound SIP REINVITE messages  is ok, outbound sip re-invite is from SBA to Gateway?

Inound is from gateway to SBA?

Check to log look gateway send reinvite to SBA but sba not response .

• Edited by Jo Tse Monday, July 20, 2015 12:43 PM change

Hi

So the problem must be network related. please have a look at the firewall rules in place between each subnet and find the difference. However, here is a link to the internal port requirements for Lync

https://technet.microsoft.com/en-us/library/gg398833.aspx

make sure that the subnet can access all ports in this document for the required services.

thanks