Hi,

We have Lync 2013 on premises and we have Hybrid exchange deployment, recently we have integrated Lync on premises with Exchange online UM, we have configured subscriber access and I have done all configuration, created hosted voice mail policy, created Subscriber access UM contact.

Problem is that if a user dials from Lync client to voice mail (Exchange online UM Subscriber Access number) the call successfully establish, if the same user is outside the organization and wants to call the Exchange online UM Subscriber Access number from his mobile or from his home phone number the call doesn't connect, this problem is not from the same user any one from outside the organization can not call to subscriber access number from his mobile or from his landline (outside the organization numbers)

I have done some logging on Lync Edge server and found two things:

When a user calls from Lync client to O365 UM Subscriber access the call establish successfully and when I see the call logs I am seeing the username@domain.com and SRV record for the domain.com is verified

When a user calls from outside the organization (Landline or mobile) to O365 UM subscriber access the call doesn't establish and when I see the call logs I am seeing +97466106903@it.domain.com and subscriber access number as +97455665566@it.domain.com and the error says Unable to resolve DNS SRV record for domain it.domain.com.

Please note our internal domain is it.domain.com and our external or smtp domain is domain.com

In Lync 2013 the default sip domain is also it.domain.com and additional sip domain is domain.com

Pleasae help me to resolve the