Description
Part of the Cisco Collaboration Edge Architecture, the Cisco FLASR1-SBC-4K license enables 4000 DBE sessions for Cisco Unified Border Element (CUBE) version releases 2.3.x and prior. This enterprise-class Session Border Controller (SBC) solution connects large, midsize, and small business unified communications networks with public and private IP communication services.
As a licensed feature set of Cisco IOS XE Software, CUBE delivers comprehensive interworking capabilities for voice, video, and mobile communications. It facilitates PSTN interconnect using SIP trunks, migration from TDM to SIP services, certified connections to cloud collaboration services like Cisco Webex CCA, Webex Calling Local Gateway, Cisco HCS, and Direct Routing for Microsoft Phone System. Additional use cases include business-to-business interconnect, multi-tenant solutions, and codec interworking via midcall renegotiation or transcoding.
Security and Compliance
- Flexible security rules to prohibit unauthorized connections
- Behavior evaluation policies detect malicious patterns like TDoS attacks, with responses to terminate, redirect, or record
- Interworking of encrypted and non-encrypted streams
- Media stream replication for call recording using SIPREC or HTTP API
Cloud Communications Services
- CUBE registration proxy manages periodic messaging from Cisco MPP or third-party SIP endpoints, reducing WAN demand
- Lineside survivability ensures business continuity for SIP phones during cloud service interruptions
Note: Lineside features for SIP-based IP Centrex like Cisco BroadCloud; not for Cisco Unified Communications Manager.
Contact Center Solutions
- Call Progress Analysis (CPA) for outbound campaigns
- Interactive Voice Response (IVR) solutions
- Media replication for recording and analysis
Flexibility, Reliability, and Scale
CUBE integrates with IP networking, security, and QoS on Cisco ISR, Catalyst Edge, ASR platforms, and virtualized CSR/Catalyst Edge Software. Supports stateful high availability with active/standby pairs and clustering. From IOS XE 17.7.1a, deployable in Cisco SD-WAN solutions.
CUBE Licensing Models
- Trunking: For service interconnect; each license enables one call session plus forked media
- Lineside: Enhances hosted SIP services; one license per endpoint for registration proxy and survivability
- Media Proxy: For recording/compliance; forks to up to five destinations
The FLASR1-SBC-4K specifically licenses 4000 sessions for DBE in Release 2.3.x and prior, compatible with Smart Licensing for entitlement pooling across platforms.
CUBE Feature Support
CUBE provides session control, security, interworking, and demarcation features including:
- Protocol interworking: SIP to SIP (Cisco Unified CM, TelePresence)
- Media: RTP/RTCP, BFCP passthrough; flow-through/around modes
- Fax/Modem: T.38 relay, pass-through, G.711
- DTMF: RFC 2833/4733, SIP notify, KPML, interworking options
- Supplementary services: Holds/transfers via REFER/REINVITE, MMoH conversion, CPA
- Internetworking: SIP profiles, PAI/PPI/RPID, MIME pass-through
- Call routing: E164/URI dialing, trunk groups, server groups, load distribution
- Multitenancy: Up to 100 VRFs
- CAC: Calls per trunk, bandwidth, thresholds
- OPTIONS ping support
- Media forking: SIPREC, API, WebSockets (enhanced license), secure forking
- IP routing: BGP, EIGRP, MPLS, policy routing, ACLs
- Voice quality: RTCP stats (loss, jitter, RTT)
- QoS: Precedence/DSCP marking, per-call
- NAT traversal: Stateful, ICE-Lite
- Network hiding: Topology hiding, back-to-back UA
- Number translation: VoIP/URI rules
- Codecs: OPUS, G.711/722/723/726/728/729/iLBC/iSAC/AAC-LD/AMR-NB
- Transcoding/Transrating: Between G.711, G.729, iLBC, G.722, OPUS (DSP req’d)
- Security: Rogue detection, IPsec, SRTP flow-through/interworking, TLS 1.2
- AAA: RADIUS
- Voice apps: TCL scripts, web API
- Billing: CDRs via AAA/syslog/SNMP
- Lineside proxy: 10 endpoints per registration
- ILS routing
- Video: H.261/263/264/MPEG4, FECC, suppression
- Manageability: Monitoring, SNMP traps, DEBUG, VoIPTrace, YANG models
- High availability: Inbox/box-to-box redundancy, port channels (enhanced license req’d)
Router Platform Support
FLASR1-SBC-4K licenses sessions on supported Cisco platforms with capacities varying by model and memory (see tech_specs for details). Supports physical ISR/ASR/Catalyst Edge and virtual CSR/C8000V. Operational capacity depends on call rate, type, transcoding, etc.


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