Support for Acme Packet Session Border Controllers in Lync Server 2010 and Communications Server 2007 R2


Microsoft Lync communications software and Microsoft
Office Communications Server 2007 R2 interoperate with Acme Packet Session
Border Controllers (SBCs) when used with SIP trunking to Internet telephony
service providers (ITSPs). This article describes the supported topologies for
using Microsoft Lync and Office Communications Server 2007 R2 with Acme Packet
SBCs.

Authors: Rui Maximo, Wajih Yahyaoui

Publication date: February 2011

Product version: Microsoft Lync Server 2010
and Microsoft Office Communications Server 2007 R2

Lync Server 2010 and Office Communications Server 2007 R2 now
interoperate with Acme Packet Session Border Controllers (SBCs). Supported
topologies are described in this article. Acme Packet and Microsoft work in
close partnership to regularly test releases of Lync Server 2010 and Communications
Server to ensure support of certain Unified Communications Open
Interoperability Program (UCOIP) certified service providers that use Acme
Packet SBCs. Acme Packet has also joined Microsoft in the Unified
Communications Interoperability Forum (UCIF), ucif.org, as a founding member.

Acme Packet SBCs are used by many Internet telephony service
providers (ITSPs) as part of their SIP trunking infrastructure. These SBCs can
be used to support SIP trunk connectivity to Communications Server 2007 R2 and Lync
Server 2010 Mediation Servers on customer premises. In some instances, ITSPs
may require an SBC to be deployed on the customer's premises as part of the SIP
trunk service for one or more of the following reasons:

  • Interworking functions   The
    service provider may support only specific signaling and media functions
    that are not supported by your environment. By deploying an SBC on
    customer premises, the service provider can resolve these differences.
  • Codecs compatibility   The
    service provider may choose to use a codec other than G.711 or RTAudio.
    The SBC deployed in the customer's network converts the codec at the
    perimeter of the customer's network. If the service provider supports the
    pass-through transit of RTAudio and RTVideo codecs, the Acme Packet SBCs are
    capable of supporting this function.
  • Quality of service   By
    deploying an SBC within the customer's network perimeter that is managed
    by the ITSP, the service provider eliminates many of the complexities of
    interoperating with the customer's systems and can guarantee better
    service quality.

There are three supported deployment models for using Acme Packet
SBCs in conjunction with a Lync Server or a Communications Server 2007 R2 SIP
trunk. The first two models involve connecting the Mediation Server directly to
an Acme Packet SBC. These deployment models are shown in Figure 1 and 2. Figure
3 illustrates a third option. These deployment models are supported only when
used for SIP trunk services that have been qualified through the UCOIP.

Figure 1 illustrates the Mediation Server connecting directly to
the Acme Packet SBC in the ITSP's SIP trunk network infrastructure.

Figure 1. Mediation Server connecting directly to the SBC in the
service provider's SIP trunk network infrastructure

Figure 2 illustrates the Mediation Server connected to an SBC that
is on customer premises but is managed by the service provider. This SBC is
deployed in the customer's network perimeter, which then links the SIP trunk to
another Acme Packet SBC in the service provider's SIP trunk network
infrastructure.

Figure 2. SBC deployed in the customer's network perimeter

Figure 3 illustrates the SBC connected to the IP-PBX, and the
IP-PBX connected to the Mediation Server through Direct SIP. In this topology,
SIP trunk connectivity for the Communications Server or Lync Server environment
is provided through the enterprise's existing IP-PBX environment (which has an
existing SIP trunk to the ITSP). This configuration requires that Direct SIP
connectivity is supported for your particular IP-PBX. You can determine whether
your IP-PBX is supported by Lync Server or Communications Server 2007 R2 by
visiting the UCOIP site.

Figure 3. SBC connected to the IP-PBX

Configuring an SBC for scenarios other than SIP trunk topologies
is not supported. For example, configuring an SBC to interconnect to an Edge
Server is not supported (Figure 4) because Lync Server and Communications
Server clients must connect directly to the Edge Server to maintain the
integrity of the end-to-end communication between clients and an Edge Server.

Figure 4. SBC connected to an Edge Server (not supported)


Summary

Microsoft and Acme Packet have collaborated to support direct
connectivity deployment models between Lync Server and Communications Server
2007 R2 Mediation Server and Acme Packet Session Border Controllers.

Additional Information

To learn more, check out the following articles:

Lync Server Resources

We Want to Hear from You

Comments (1)
  1. SCa says:

    Hi. In the "Codecs compatibility" section, you mention the possibility to have RTVideo codec passing through SBC, while SBC is connected to Lync using SIP Trunk.

    Unless i'm wrong, video is not available when using SIP Trunk connection. Could you clarify if we can really get video through SBC using SIP Trunk ?

    Thanks.

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