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Call Admission Control Usage Scenarios

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Bandwidth management can be applied in a number of scenarios. This topic presents several of the scenarios that occur most often.

Basic Success

John in Spokane places a Microsoft Lync 2010 audio call to his company’s general information line, an interactive voice-response (IVR) application. The WAN link is free, so John’s call proceeds as normal, after checking with the Policy Distribution Point. The call is established, and audio flows between John’s endpoint and the IVR.

Basic Failure

John in Spokane places a Lync 2010 call to his company’s general information line, an IVR. The WAN link is overburdened, and John’s call cannot be redirected to PSTN, so it fails. John is informed that the call has failed due to the Call Admission Control’s failure to provision the WAN link. John’s network administrator, Bob, is able to determine that this failure occurs frequently. To provide better network management, Bob purchases a larger link. Additionally, the application is informed of the failure, and the reason (CAC failure).

Redirect to PSTN

Gordon is on the Microsoft Lync Web App from the Zurich Office. He calls in to an audio-only conference hosted in Redmond. The WAN link from Zurich to Redmond is slightly overburdened, so Gordon’s session with the conference is redirected to PSTN through the Zurich Branch Office Appliance. The call completes successfully, and Gordon listens to the conference. (The user interface informs Gordon that he has been redirected, in a manner similar to that of the Lync 2010 user interface.)

Interoperation with Previous Microsoft Exchange Versions

Alice (in the Chelan office, a branch office with a Branch Office Appliance) is making a call to Outlook Virtual Assistant to check on the meeting she has later in the day. Alice’s datacenter is running Microsoft Exchange Server 2007. Even though her link to the datacenter is overburdened, logic in the Microsoft Unified Communications Managed API (UCMA) 3.0 Core SDK endpoint prevents it from applying bandwidth management policy to the SDP content of the Microsoft Unified Communications Managed API (UCMA) 2.0 endpoint, and the call goes through. Call quality might be degraded, but this is an acceptable tradeoff.