Keep the numbers and the workflows. Replace the box, the chan_sip stack or the suite you cannot extend.
Keep the DIDsParallel runPJSIPCloud / VPCOptional AIRollback
This is the outcome for teams who already have a phone system and need it off the appliance, off chan_sip, or off a suite they cannot change. Services supply the engines. This page is the job: move production without losing the DID.
2026 buying brief
Who this is for
IT and operations who cannot buy another hardware IPPBX and cannot freeze the current vendor for five years.
What you get
A written move plan, a parallel SIP path and a cut that can roll back.
Searches this page answers
Replace hardware PBX, migrate to hosted PBX, office phone system modernization.
Solution architecture
Outcome: the number still rings
Business jobKeep calling · drop the box
↓
Numbers & carriersDID, CLI, failover
Call controlNew PBX · PJSIP
ExperienceSame hours / IVR / queues
RecordCRM still written
If a box is missing on cut-over day, you migrated a demo.
Success looks like
Same DIDs
Inbound reputation does not reset because someone ‘got a new number’.
Same humans
Reception, hunt, voicemail, then extras.
Inspectable core
Software PBX you can SSH, not another locked appliance.
A next plane
WebRTC, SaaS tenancy or AI voice when the path is stable.
FAQ
Questions buyers ask before hiring
Direct answers on scope, stack, rescue vs build, and how to start, structured for search and AI summaries.
Direct answers on scope, stack, rescue vs build, and how to start, structured for search and AI summaries.
Consulting produces decision records, diagrams and risk lists you can hand to any team. Development includes the same clarity plus implementation, tests and production cutover.
Yes. Reviews cover tenant leakage, trunk security, recording paths and whether the gap is configuration or product architecture.
REGISTER only proves the trunk credentials. INVITE, identity headers, codec offers, RTP pinholes and carrier-specific IMS rules still have to pass. Indian PSU and PRI-over-SIP profiles are a common example, see SIP registered but no calls.
Use CPaaS when volume is low and speed matters. Own SIP when margin, recording locality, custom routing or multi-tenant resale is the product. Hybrid designs are normal in 2026.
Yes. We work from pcaps and SDP: NAT, security groups that open 5060 but not RTP, transcoding, ICE/TURN and REFER/re-INVITE behaviour, not guesswork.
We implement PJSIP/Sofia profiles, digest vs IP auth, OPTIONS keepalives and test matrices your carrier publishes. Legal STIR/SHAKEN attestation is jurisdiction-specific; we implement the technical path your provider supports.
Share the current stack (PBX, CRM, cloud), the failure or goal in one paragraph, peak call volume, carriers, and any deadline. Screenshots, a pcap, or a short Loom beat a 40-page RFP. Use the project brief
Yes. Delivery is remote-first from Delhi with scheduled overlap for EU, UK, US and APAC stand-ups. Production changes use written runbooks, rollback steps and agreed maintenance windows.
Yes. Many engagements begin with a 1–2 week SIP trace review, tenant-isolation audit, or architecture assessment. If the fit is good, scope expands from evidence, not from a generic sales deck.
Founders, CTOs, telecom leads, MSPs and product teams building or fixing UCaaS, CCaaS, CRM+voice, AI voice, or vertical SaaS, not buyers who only need seats on a mass-market suite.
Need this built?
Send the current architecture, call volume, carriers and the workflow you need to automate or productize. Discovery can start from a broken PBX or a blank product brief.