Incomming calls failing with tel:<number> on from (Rejection cause 400 Bad Request)

[nunoalves]

Hello,
Can anyone help me with the following?
I'm receiving from the provider the Invite and 3CX immediately disconnects with 400 Bad Request
My interpretation is that the provider is not sending the From in the correct format. (missing SIP to address: +351923456765)
Is there any way to overcome this issue on the 3CX side?

Session Initiation Protocol (INVITE)
Request-Line: INVITE sip:[email protected]:5060;rinstance=49dba5575040e680 SIP/2.0
Message Header
Via: SIP/2.0/UDP z.z.z.z:5070;branch=z9hG4bKcljq73200gt4kbjssp60.1
To: <tel:+351yyyyyyyyy>
SIP to address: tel:+351yyyyyyyyy
From: tel:923456765;tag=p65540t1625163432m227516c26184s1_3642008593-846846844
SIP from tag: p65540t1625163432m227516c26184s1_3642008593-846846844
Call-ID: p65540t1625163432m227516c26184s2
[Generated Call-ID: p65540t1625163432m227516c26184s2]
CSeq: 1 INVITE
Max-Forwards: 65
Content-Length: 317
Contact: <sip:[email protected]:5070;transport=udp>;+g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel"
Contact URI: sip:[email protected]:5070;transport=udp
Contact parameter: +g.3gpp.icsi-ref="urn%3Aurn-7%3A3gpp-service.ims.icsi.mmtel"\r\n
Content-Type: application/sdp
Allow: REGISTER, REFER, NOTIFY, SUBSCRIBE, PRACK, UPDATE, INVITE, ACK, OPTIONS, CANCEL, BYE
Accept: application/sdp
Supported: timer, 100rel, histinfo
Min-SE: 900
Session-Expires: 1800
P-Called-Party-ID: <tel:+351yyyyyyyyy>
P-Early-Media: supported
Session-ID: 1fe6ebf5255d313ddd7c9d7d37869196
P-Charging-Vector: icid-value=36kq5046p1ds2rk6ehcs2pg6hhoamfde9rpulo462jucmh78;icid-generated-at=z.z.z.z
Message Body

 

[YiannisH_3CX]

Hi @nunoalves

I would recommend using a 3CX supported provider as 3CX does not support tel URIs in the Invite messages. So the short answer is that there is no way to overcome this on the 3CX side.

 

[nunoalves]

Hello,
I've other calls with tel in URI that are ok.
As an example this call was successfully completed
Message Header
Via: SIP/2.0/UDP z.z.z.z.:5070;branch=z9hG4bKhiddgb30bgir6p5dq400.1
To: <tel:yyyyyyyyy;phone-context=z.z.z.z>
SIP to address: tel:yyyyyyyyy;phone-context=z.z.z.z
From: sip:[email protected];tag=p65540t1625163489m972510c83339s1_3699750923-51731748
SIP from address: sip:[email protected]
SIP from tag: p65540t1625163489m972510c83339s1_3699750923-51731748

The only visible difference is the missing 'SIP from address' in the failing call

 

[leejor]

Who is the provider? Others may have experience, in dealing with them.

 

[nunoalves]

My provider is MEO / Altice in Portugal