ShelCron

VoIP & Telecom

SIP Trunking

Primary and failover SIP trunks with codec policy, fraud controls, and quality monitoring.

We design and bring up SIP trunks that connect your PBX, softswitch, or contact-center platform to carriers—with explicit failover, codec negotiation policy, and monitoring so quality issues are visible early. Suitable for enterprises consolidating carriers and for platforms adding new interconnects.

From $2,499

Who it’s for

  • Enterprises consolidating voice carriers
  • MSPs provisioning trunks for customers
  • Contact centers adding capacity or redundancy

Problems we address

  • Single-trunk dependency with no tested failover
  • Codec mismatches causing one-way audio or poor MOS
  • Fraud exposure on open or weakly authenticated trunks

Expected outcomes

  • Primary + failover trunk design with documented cutover
  • Codec and RTP policy aligned to your endpoints
  • Auth, ACL, and rate controls appropriate to the interconnect

Capabilities

Concrete engineering capabilities included in a typical engagement for this service.

Trunk design and carrier onboarding support

SBC/edge configuration for trunk traffic

Failover and health-check strategies

Basic fraud controls on trunk edges

QoS and alert baseline

Technology

Representative technologies used for this service. Final stack depends on your estate.

  • SIP
  • SBC
  • SRTP
  • TLS
  • FreeSWITCH
  • Asterisk
  • Prometheus

Architecture

Voice signalling path

Users and carriers meet through SBC, SIP proxy, and media services.

UsersAgentsSBCSIP ProxyMedia ServerCarrier

Deliverables

  • Trunk inventory and dial-plan mapping
  • Configured primary and failover paths as scoped
  • Test call evidence and acceptance checklist
  • Monitoring alerts for trunk health
  • Ops notes for carrier escalations

Out of scope

  • DID wholesale brokerage
  • Carrier contract negotiation

Timeline

Typical timeline

1–3 weeks

Timeline depends on scope, access, and dependencies—not a delivery guarantee.

Process

A clear delivery path from discovery through handover and optional support.

  1. 01

    Discovery

    Goals, constraints, success criteria, and current-state review.

  2. 02

    Architecture

    Target design, interfaces, risks, and delivery sequence.

  3. 03

    Implementation

    Incremental build with visible progress and documented decisions.

  4. 04

    Testing

    Functional checks, failure paths, and acceptance criteria validation.

  5. 05

    Deployment

    Controlled release to staging and production with rollback paths.

  6. 06

    Handover

    Runbooks, access notes, and operator/admin walkthrough.

  7. 07

    Support

    Optional hypercare window or retainer continuity after go-live.

Packages

Scoped offerings you can add to cart, or request a quote when the fit is custom.

Compare packages

SIP Trunk Setup

Primary + failover trunks with monitoring alerts.

$2,499

  • Primary and failover trunk configuration
  • Codec and auth policy
  • Basic fraud controls on the edge
  • Monitoring alerts and handover notes

FAQ

No. We engineer the technical interconnect and can advise on what to ask carriers for, but commercial negotiation stays with you.

Ready to build?

Tell us about your environment, constraints, and target outcomes. We’ll recommend a package or a scoped quote.