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This section describes specific scenarios involving the deployment of a
Session Border Controller within a Network-Network-Interface (NNI) across two carriers. The use cases described in this section illustrate the
features from a user’s standpoint in the peering network.
The Peering or Network-Network Interface (NNI) refers to the service control interface between two or more IP networks.
acting as a peering
connects these IP networks (carriers, sub-networks, long distance networks, etc.) providing extensive routing capabilities and resource management.
in this configuration is also referred to as a Trunking
(T-
). In NNI deployment the call model does not support registration, refreshes etc. It supports only SIP calls conforming to a highly scalable model. The
in peering deployment includes the following characteristics:
- Provides protection to the core both from malicious attacks and genuine but high traffic levels.
- Acts as a B2B UA to bridge/bond the ingress/egress SIP sessions while maintaining distinct networks at the lower layers.
- Provides facilities for protocol repair and adaptation.
- Polices/enforces bandwidth and resource utilization.
- Provides encryption services.
- Interwork between combinations of IPv6 and IPv4 for both media and signaling (does not translate between IP address types).
- Performs a key role in routing by selecting between different carriers.
- Provides transcoding functionality and normalizes traffic to the core since sits at the edge (operator-dependent).
- Acts as IBCF in the IMS network environment.
Peering
enforces bilateral agreement by ensuring the correct aspects and interpretations of the SIP protocol between carriers.
- Ensuring each side receives the expected SIP headers, formats and content.
- Applying ingress/egress signaling filters.
- Ensuring transparency of SIP content (operators may use information the does not understand).
- Providing SIP Message content manipulation functionality.
Peering (NNI) deployments
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| This diagram does not reflect that each network in an NNI deployment can have multiple s ( or 3rd-party s) at the border. |
Additional topics:
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