# Trunk No Register Provider 1und1

**URL:** https://forums.vitalpbx.org/t/trunk-no-register-provider-1und1/6030
**Category:** VitalPBX
**Created:** [February 5, 2026, 7:42pm UTC](https://forums.vitalpbx.org/t/trunk-no-register-provider-1und1/6030 "2026-02-05T19:42:24Z")
**Posts on this page:** 4
**Page:** 1

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### Author: ![marian](https://forums.vitalpbx.org/letter_avatar_proxy/v4/letter/m/f475e1/32.png) [@marian](https://forums.vitalpbx.org/u/marian)
#### Post date: [February 5, 2026, 7:42pm UTC](https://forums.vitalpbx.org/t/trunk-no-register-provider-1und1/6030/1 "2026-02-05T19:42:25Z")

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I’ve configured the NAT settings and set the external media and signal addresses, including the external IP address. Is there a way to use a DynDNS name or a STUN server?

My problem is that the 1&1 trunk isn’t registering.

Thx

 ![IMG_1307](https://forums.vitalpbx.org/uploads/default/original/2X/b/b418b3e560959b984b4c1b6eead51d3061237d55.jpeg)  
 ![IMG_1308](https://forums.vitalpbx.org/uploads/default/original/2X/5/53515d09b59acc5ff046d2731bea84e0e5804bc6.jpeg)

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### Author: ![miguel](https://forums.vitalpbx.org/user_avatar/forums.vitalpbx.org/miguel/32/415_2.png) [@miguel](https://forums.vitalpbx.org/u/miguel)
#### Post date: [February 5, 2026, 9:02pm UTC](https://forums.vitalpbx.org/t/trunk-no-register-provider-1und1/6030/2 "2026-02-05T21:02:00Z")

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Try using a public static IP Address

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### Author: ![marian](https://forums.vitalpbx.org/letter_avatar_proxy/v4/letter/m/f475e1/32.png) [@marian](https://forums.vitalpbx.org/u/marian)
#### Post date: [February 6, 2026, 5:28am UTC](https://forums.vitalpbx.org/t/trunk-no-register-provider-1und1/6030/3 "2026-02-06T05:28:56Z")

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Hi,

The ContactUser was requiered

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### Author: ![system](https://forums.vitalpbx.org/uploads/default/original/1X/672b458a1d454755270c2c16adc5316b641c3c6a.png) [@system](https://forums.vitalpbx.org/u/system)
#### Post date: [March 8, 2026, 5:29am UTC](https://forums.vitalpbx.org/t/trunk-no-register-provider-1und1/6030/4 "2026-03-08T05:29:47Z")

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