To resolve this issue, create a Contact object in the Exchange Admin Center, and then add the external contact’s IM address to the Proxy Address field. Make sure that the IM address contains the sip: prefix for the IM address of the external contact. For more information about how to create an external contact in the Exchange Admin Center, go to the following Microsoft website:sip:firstname.lastname@example.org format for the address.
The IM address must also exist as a SMTP proxy address for the user account. Although the IM address doesn't have to be a primary SMTP address, it must exist so that the user and the SIP address can be located.
ID članka: 2977259 - Poslednji pregled: 29.12.2016. - Verzija: 1