Automate Let's Encrypt certificates on TE-SYSTEMS anynode (Azure VM)

Certificate automation on legacy SBCsMANUAL FIX INSIDEFREE — NO SIGNUP
Quick answer. anynode is excellent SBC software but has no native ACME client — Let's Encrypt certificates have to be issued elsewhere and imported by hand every 90 days, which is exactly the renewal trap that causes full voice outages when a human misses one. The workable automation on an Azure VM is to run an ACME client next to anynode, issue a wildcard via the DNS-01 challenge (no inbound HTTP exposure), and push the renewed chain into anynode through its import path — then let cron repeat it forever. The result is a renewal cycle nobody babysits: issue, format for import, push, reload — the same steps VoipFlow runs natively per tenant.

The raw code check

Run this before you change anything — it confirms the root cause in one pass:

manual renewal day (every 90 days)FAIL
day 89: calendar reminder fires for 4 tenants
day 90: 3–5h of L2 time per tenant (issue, format, upload, reload)
day 91: one missed → office voice dark, SLA breach
automated cycle on the VMOK
cron: acme.sh --issue --dns dns_azure -d 'sbc.example.com'
acme: wildcard issued (DNS-01, no inbound HTTP)
formatter: chain + key → anynode import bundle
anynode: certificate imported, listener reloaded — 0h of L2 time

The manual fix — 3 steps

  1. Install an ACME client and issue a wildcard via DNS-01. On the Azure VM (or a management VM beside it), install acme.sh and issue a wildcard with the Azure DNS plugin — the exact command shape is: acme.sh --issue --dns dns_azure -d sbc.example.com -d '*.sbc.example.com'. DNS-01 avoids opening any inbound HTTP port and covers every tenant subdomain with one certificate.
  2. Format the chain for import and push it into anynode. Bundle the issued fullchain and key the way anynode's certificate import expects (the free Let's Encrypt Auto-Formatter on this site produces the bundle format anynode, AudioCodes, and Ribbon imports take). Import via anynode's web UI (certificate management) or its REST configuration API, whichever your change process allows.
  3. Automate the renewal and reload with cron. acme.sh installs its own renewal cron; add the deploy step to it with --install-cert and a reload command (the anynode REST call that reloads the TLS listener). Test the whole cycle once by forcing a renewal — acme.sh --force --renew — and watch the certificate appear on the SIP TLS listener with zero dropped calls.

The automated alternative

If you'd rather never do this again: VoipFlow runs this whole class of maintenance as software — certificate issue-and-bind in about 12 seconds, signaling on port 5062 so SIP ALG rewriting never engages, per-tenant isolation, flat $399/mo. The 14-day sandbox is free, no credit card, and no sales follow-up unless you ask for one.

Deploy Free 14-Day Sandbox — No Credit Card Required

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