Generate starter IOS-XE config for a CUBE SIP trunk to a carrier: voice service voip, SIP UA, codec list, SRTP, dial-peers, and CUCM-side SIP trunk matching.
Every carrier wants the same things in a different way. This generator produces a full IOS-XE config block you can paste into your CUBE, fix IPs/numbers, and be testing calls in an hour — not a week of guesswork.
Set inputs, click Generate CLI.
Global SIP behavior.
Registration, if needed.
Voice class codec list.
Inbound + outbound routing.
Matching trunk config.
Number translation: the carrier delivers DIDs in one format (often +E.164, sometimes NANP 10-digit), CUCM wants them in internal format (4-5 digit extensions). Translation happens on CUBE via voice translation-rule + voice translation-profile. Build a profile per direction (inbound = carrier-to-CUCM, outbound = CUCM-to-carrier) and apply on the dial peer. Skipping this pushes the problem into CUCM where it's harder to debug.
Early media: when a carrier plays ringback or "number not in service" before the call is answered, you need early-offer forced or calls will have one-way audio. This is the #1 call-quality bug in SIP trunk deployments. Some carriers also need no modem passthrough and fax protocol t38 settings — they break T.38 faxing otherwise.
SRTP + carriers: most US carriers support SRTP over SIP-TLS (SIP/5061 + SRTP/SAVP). If you enable SRTP on CUBE, it must match CUCM (MRA or SRST) and carrier crypto offers. One mismatch and the call hits "bad offer" errors. Pass-through SRTP (where CUBE doesn't touch the crypto) is much simpler and works for most carriers — use end-to-end crypto rewrite only when you need to interwork TLS-inside with TCP-outside.
It's a starter — you'll need to adjust IPs, translation rules, and carrier-specific headers.
show sip-ua register status (if registering) or show dial-peer voice summary.
CUBE does not do SRST — that's a separate feature on the voice gateway role.
Debug: debug ccsip messages. Most issues are SDP (codec offer/answer) or From/To header format.
US office.
Financial services.
Cloud-to-PSTN bridge.
Our UC Modernization Sprint includes CUBE bring-up with the carrier, SRTP, and full-call testing.