Connect a Yealink W-series DECT phone to a NumberGroup SIP trunk
Map your NumberGroup SIP trunk credentials onto a Yealink W-series DECT base (W56/W60/W70 single-cell, W80/W90 multi-cell) and assign the account to a handset. Mapping table plus Yealink's own guide.
This registers a Yealink W-series DECT system to a NumberGroup SIP trunk. The account fields are the same as Yealink's desk phones — if you've set up a T-series, this will feel familiar — with one DECT-specific extra: after you enter the account you assign it to a handset. Covers the single-cell W56B / W60B / W70B and the multi-cell W80 / W90 (which reach the same fields by a slightly different menu).
When you ask us to set the trunk up, request Send Numbers As set to "United Kingdom" so Caller ID arrives in the familiar 01214001262 format on the handset screen.
The credentials and settings your device needs to register against the NumberGroup SIP trunk are:
- Domain / registrar:
sip.numbergroup.com - Authorisation ID (also called SIP username): looks like
T-AAAAAA-NNNe.g.T-102377-001 - Password: a random string we generate per trunk
- User-Agent Type: we set this our side to match your device (e.g. 3CX Phonesystem, DDI in R-URI (Asterisk), RFC3261 Standard Trunk) so DDIs present in the format your equipment expects
- Send Numbers As: also set our side — pick the format that works best for your platform:
- International (+xx) — true E.164 (
+441214001262) for 3CX, Cisco, Yealink and most modern PBXs - International (xx) — bare digits (
441214001262) for Asterisk / FreeSWITCH dialplan regex - United Kingdom — UK format (
01214001262) for direct-register desk phones / softphones where humans read the Caller ID
- International (+xx) — true E.164 (
- Allowed IPs (optional): for an extra security layer we can lock the trunk to only register from your office IPs — tell us which when you ask
Once you have the credentials, the rest of this guide walks through the device-side config. If you'd rather skip the config altogether, ask us — we'll do it for you on most common PBXs and phones.
Field mapping
Yealink owns the click-path and keeps it current — the table below maps each NumberGroup value to its exact field. Single-cell bases reach these under Account → Register; multi-cell W80/W90 reach the same fields via Handset & Account → Handset Registration.
Find the base's IP (on a single-cell base, press and hold the paging key briefly or check your router), browse to it from a computer on the same LAN, then open Account → Register (single-cell) or Handset & Account → Handset Registration (multi-cell W80/W90). Finish by assigning the account to a handset under Number Assignment.
Full navigation is in the manufacturer's own guide: Yealink Support — search your W-series model for the account-registration guide. We keep the click-path with them so it stays current — the table below is the part that's specific to your NumberGroup trunk.
| NumberGroup value | Yealink W-series field |
|---|---|
| Line Active | Enabled (Account → Register) |
| sip.numbergroup.com | Server Host (SIP Server 1) (Account → Register) |
| 5060 | Port (Account → Register) |
| UDP | Transport (Account → Register) |
| T-AAAAAA-NNN | Register Name (Account → Register) |
| T-AAAAAA-NNN | User Name (Account → Register) |
| your trunk password | Password (Account → Register) |
| RFC2833 | DTMF Type (Account → Advanced) |
| STUN off | STUN = Disabled (Account → NAT) |
| PCMU, PCMA, G722, G729 | codec list (Account → Codec) |
| assign to handset | Number Assignment — tick the handset for this account |
Split-field note: like the desk Yealinks, the W-series splits Register Name (auth ID) from User Name (SIP user). On a NumberGroup trunk both take the same value — your T-AAAAAA-NNN.
Don't skip Number Assignment. The account can register fine, but until it's assigned to a handset, no handset can make or take calls on it.
Verify
- The base web UI shows the account registered, and the assigned handset shows a line indicator
- We can confirm the trunk has registered our side — ring us or check the trunk-live email
- Dial your mobile from the handset to confirm Caller ID; ring your DDI from a mobile to confirm inbound
If it won't work
- Registered but the handset can't call: you missed Number Assignment — tick the handset for this account
- Won't register: wrong Register Name / User Name / Password, or Server Host not
sip.numbergroup.comexactly - Outbound UDP 5060 blocked on your network firewall
- Outbound rejected with 403: your Default CLI on the trunk isn't one of your DDIs — fix on the trunk
Set fraud caps before going live
A DECT base with several handsets should be capped to your real peak. Ask us to set Fraud Detection Simultaneous Calls and a sensible Daily Spend ceiling. See our telecom fraud guide.
Cordless that just works
Members get SIP trunks with no per-channel fee and BT Wholesale call rates passed straight through — run your DECT handsets across the site on a modern carrier without replacing the kit.