> Markdown version of [/jobs/ext/4706390-principal-numbering-interconnection-specialist](https://www.wearedevelopers.com/jobs/ext/4706390-principal-numbering-interconnection-specialist). Every page supports `.md` or `Accept: text/markdown`. Links point to the HTML versions so they work for humans too. Agent guide: [/agents.md](https://www.wearedevelopers.com/agents.md). --- # Principal Numbering & Interconnection Specialist - **Company:** Sinch, LLC - **Location:** Chicago, IL, United States (Remote available) - **Experience:** Expert - **Salary:** $123,000 - $155,000 - **Contract:** Permanent contract - **Skills:** VoIP, Databases, Customer Data Management, Data Integrity, Routing - **Published:** November 13, 2026 - **Apply:** https://www.jofdav.com/jobs/60518010-principal-numbering-interconnection-specialist ## About the Role * 10+ years in numbering, interconnection, code administration, or carrier regulatory operations at a carrier, wholesale provider, or interconnected VoIP provider. * Hands-on filing experience with NECA company code administration, NANPA, and NRUF. * Fluency in LERG and BIRRDS routing data, with the ability to trace a call failure to the record that caused it. * Working knowledge of Section 251 and 252 interconnection and interconnection agreement structure. * Awareness of carrier filing obligations, including Forms 499 and 477, USF, the Robocall Mitigation Database, STIR/SHAKEN, and state certifications, and of intercarrier compensation under bill-and-keep. * A demonstrated habit of following FCC and state proceedings. * Clear written communication, including the ability to reduce a rulemaking to a one-page brief. * Composure in customer-facing work * Experience at a wholesale carrier or carrier's carrier serving other providers rather than end users. * Experience supporting customers through their own direct access numbering authorization. * Participation in NANC working groups and ATIS committees. This is a remote opportunity, but candidates must reside near one of our hub locations for occasional collaboration: Atlanta, GA; Chicago, IL; San Antonio, TX; Denver, CO ## Description The Principal Numbering & Interconnection Specialist will serve as a subject matter expert for Sinch's numbering and interconnection operations, overseeing the administration of company codes and numbering resources, ensuring accuracy and integrity of industry routing databases such as the LERG and BIRRDS, managing numbering inventory and utilization, and supporting wholesale customers with numbering and routing requirements. This role will also provide expertise in interconnection agreements, monitor regulatory developments and industry requirements, and ensure Sinch remains compliant with evolving numbering and interconnection obligations. * Code Administration: Own the lifecycle of our company identifiers. OCN and company code assignment and maintenance through NECA, ACNA and CIC administration, CLLI creation through iconectiv CLONES. * Numbering Resource Management: Mastery of the process of filing and managing NPA-NXX code applications and thousands-block applications through NANPA, including Part 1, 1A, 1B, 3, and 4 handling, forecasting, months-to-exhaust justification, and state commission approvals where numbering authority is delegated. * Routing Data Integrity: Oversee and maintain accuracy in BIRRDS and the LERG across LRN assignment and mapping, switch and tandem homing, rate center and LATA assignment, and OCN relationships. Manage activation dates against the LERG publication cycle and drive code opening through to other carriers loading the code. Work with internal teams and customers to implement customer routing setups and troubleshoot * Inventory & Utilization: Ability to reconcile number inventory against LERG, NPAC, and NANPA records. Ability to file semiannual NRUF reports, forecast utilization, and respond to audits and reclamation notices. * Customer Data Assurance: Work directly with wholesale customers to confirm their numbering assets are correctly represented in industry databases. Review OCN and SPID alignment, rate center and LRN assignment, and block records at onboarding and on an ongoing basis. Own resolution of routing failures traced to record errors, and correct the upstream cause. * Interconnection Expertise: Act as an authority on Section 251 and 252 interconnection. Interpretation and compliance of our existing agreements, monitor inbound carrier notices for copper retirement, network change, and discontinuance. * Regulatory Foresight: Track FCC and state proceedings that change numbering and interconnection obligations. Brief leadership on timelines and exposure, and support comments, reply comments, and exparte filings.