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Cisco is the enterprise networking giant. For over five years, its communications operation has run on Telnyx, spanning SIP trunking, numbering, private connectivity, and messaging across three continents. What started as a trunking and numbering relationship grew into a multi-product infrastructure footprint that now extends into connected device connectivity.
A production spec, not a trial
Cisco came to Telnyx with a production migration spec, not a trial. The requirements were enterprise-grade:
- High-availability SIP trunking with 500 concurrent ports across an HA pair, 10 calls per second per trunk
- Full SIP method support including REFER for call transfers, plus PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, and MESSAGE
- Codec auto-negotiation (G.711/G.729) and RFC2833 DTMF handling
- Heartbeat monitoring with OPTIONS ping enablement
- CDR with mandatory SIP CALL ID for billing reconciliation, delivered via SFTP or API
- RTCP enabled at trunk level for real-time call quality monitoring
- 24/7 SLA coverage for P1 and P2 incidents, with 48-hour advance maintenance notification
- Number portability for existing DIDs
- Guaranteed CLI on outbound across mobile and landline numbers
That is the spec of a team that has run voice at scale before and knows exactly what it needs from a carrier.
Solution
Voice at enterprise scale
Telnyx delivers it. Today Cisco runs on a stable, privately connected network built to handle high call volumes without relying on the public internet. SIP Trunking carries the voice traffic at enterprise scale, with the HA pair and concurrency Cisco specified.
A massive local number fleet covers the markets Cisco serves, supported by toll-free numbers for inbound services and API-based provisioning and porting.
That scale is backed by the controls needed for enterprise voice. STIR/SHAKEN supports trusted caller identity with A-level attestation where eligible, while HD Voice and wideband codecs such as AMR-WB help keep conversations clear across both the customer and agent legs.
Messaging on the same platform
SMS and MMS handle messaging workloads on the same platform that carries the voice traffic. Number Look-Up handles verification and routing, so Cisco can validate and format numbers before they enter a call flow.
Private connectivity, not public internet
The connectivity is private. Cisco has Virtual Cross Connects in San Jose, Frankfurt, and London, carrying voice media between its data centers and the Telnyx network off the public internet. That means lower latency, fewer hops, and no exposure to public routing instability. Two separate product lines, WebEx Calling and Contact Center, run on the same platform with their own accounts, each with its own commits and billing.
Five years and counting
The next phase is already in motion: deeper infrastructure coverage, and a proven foundation built to handle whatever Cisco routes through it next. For a company that wrote a production spec before signing, the platform has to deliver on every line of it. Five years later, it still does.
