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You need to modify all contact no and update
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You need to modify all contact no and update

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We have implemented Skype for Business 2015 PSTN conferencing without Enterprise Voice.<br />
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We do not use address book normalization because we have call centers that do not want unique phone numbers or extensions listed in their contact cards and all of them having the same phone number causes a mix up of user information among those users.<br />
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Users enter the phone number they want the conference to use when they choose the &quot;Call me at&quot; feature when joining conferences in the client phone options Work field.<br />
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This number is being cleared randomly.<br />
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Has any one seen this before? &nbsp;If so what was the resolution?
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We have implemented Skype for Business 2015 PSTN conferencing without Enterprise Voice.

We do not use address book normalization because we have call centers that do not want unique phone numbers or extensions listed in their contact cards and all of them having the same phone number causes a mix up of user information among those users.

Users enter the phone number they want the conference to use when they choose the "Call me at" feature when joining conferences in the client phone options Work field.

This number is being cleared randomly.

Has any one seen this before?  If so what was the resolution?

Client loses work number

Microsoft Lync Server (renamed Skype for Business Server in 2015) is a real-time communications server software that provides infrastructure for enterprise instant messaging, presence, VoIP, ad hoc and structured conferences (audio, video, and web), and PSTN connectivity through a third-party gateway or SIP trunk. These features are available within and between organizations, and with external users on the public internet or standard phones (on bpth PSTN and SIP trunking).

Microsoft Lync Server

Web conferencing describes various types of online collaborative services including web seminars ("webinars"), webcasts, and peer-level web meetings. In general, web conferencing is made possible by Internet technologies, particularly on TCP/IP connections. Services may allow real-time point-to-point communications as well as multicast communications from one sender to many receivers. It offers data streams of text-based messages, voice and video chat to be shared simultaneously, across geographically dispersed locations. Applications for web conferencing include meetings, training events, lectures, or presentations from a web-connected computer to other web-connected computers. Popular titles include GoToMeeting, Cisco WebEx, Microsoft Lync, TeamViewer and Skype.