Sip client on Iphone, Android gives "forbidden" error to Mitel CX-II

[michielkleinwillink]

Dear Sir / Madam,

I would like to get answers a questions regarding a mobile SIP-client.

- When we install a SIP cliënt on a mobile phone, it will give the message "forbidden" during registration. We have tested serveral iPhone and Android clients. (Bria, X-lite, 3cx, other free sip clients)

The Windows desktopcliënts just work! (x-lite, 3cx) same network.

It is a annoying problem

PBX information:
Release 4.2 SP2 PR1
Call Control Relink 40.2.2.7_SP2
Active software 10.2.2.15
Platform CX-II, 512MB

[michielkleinwillink]

Remark: without sip password/pincode it works. There is some issue with authentication on mobile devices and Mitel PBX.

Not a very well solution...