3CX app on iOS is unable to call outbound after a while, error: forbidden - inbound still working normally

[TomTheOne]

Hi all

I have a strange behaviour on the iOS app since i've installed the 3cx approx. 2 yeas ago. I'm on version 18.0 build 312.

1. I connect my user to the 3cx app on my iOS device by using the QR-code.
2. I can call out and can receive calls, everything normal so far.
3. After a unknow amount of time, i can not call out anymore.
3a. The error i get on the iOS app on the top right of the corner is "Forbidden".
3b. The logfile on the 3cx server says:

07/05/2023 6:53:41 PM - [CM102001]: Authentication failed for AuthFail Recv Req INVITE from 62.3.2.1:5060 tid=66b0f758aa198732 Call-ID=bwPA-anfsUD2fFKpWfEEIg..:
INVITE sip:[email protected];tag3cx=1ctmqgm7 SIP/2.0
Via: SIP/2.0/UDP 1.2.3.4:5060;branch=z9hG4bK-524287-1---66b0f758aa198732;rport=5060;received=62.3.2.1
Max-Forwards: 70
Contact: <sip:[email protected]:5060>
To: <sip:[email protected];tag3cx=1ctmqgm7>
From: "Tom Somename"<sip:[email protected]:5060>;tag=858ff802
Call-ID: bwPA-anfsUD2fFKpWfEEIg..
CSeq: 2 INVITE
Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REGISTER, SUBSCRIBE, NOTIFY, REFER, INFO, MESSAGE, UPDATE
Content-Type: application/sdp
Proxy-Authorization: Digest username="",realm="3CXPhoneSystem",nonce="414d535964a5a01512:3f7a4a9f44d2559f21b9616f9a50c44d",uri="sip:[email protected];tag3cx=1ctmqgm7",response="c8c10f196d01c11e59d60c9dffefdf23",algorithm=MD5
Supported: replaces, timer
Content-Length: 486

v=0
o=3cxPS 25151304393293824 32110906611597313 IN IP4 62.3.2.1
s=3cxPS Audio call
c=IN IP4 62.3.2.1
b=AS:117
t=0 0
a=X-nat:0
m=audio 9012 RTP/AVP 0 8 9 18 125 101
c=IN IP4 62.3.2.1
b=TIAS:96000
b=AS:117
a=sendrecv
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000
a=rtpmap:9 G722/8000
a=rtpmap:18 G729/8000
a=rtpmap:125 opus/48000/2
a=fmtp:125 useinbandfec=1
a=rtpmap:101 telephone-event/8000
a=fmtp:101 0-15
a=rtcp:9013
m=video 0 RTP/AVP 31
c=IN IP4 127.0.0.1
; Reason: Credentials don't match, check that authorization-ID and password match the ones in extension settings

4. If this happen, i still can receive calls without any issue.
5. I have another account on my iOS device for another 3cx appliance.
5a. I can switch the account to the other account of the 3cx appliance and switch back to the account with the issue, or
5b. I can remove the account and re-add it by using the QR-code, then...
6. ...everything is back normal and please go back to 2. The same procedure/issue repeats in a loop.

Sidenote:
- A phone connected to the same number via SIP is working without any issue all the time.
- It doesn't matter if i'm inside the network (same segment as the 3cx) or if i'm connected via mobile 4G/5G connection.

Did somebody saw this issue in the past? Somebody knowing what the issue could be? Any ideas?

Have a good evening,

Regards
Tom

 

[TheodorosG_3CX]

Although this might require further investigation, however this happens when you try to make a call from the call history or if you dial a number?
Have you ensured that this is not an outbound rule issue?

 

[TomTheOne]

Hi Theodoros/Charles,

Thanks for your reply.

> Although this might require further investigation, however this happens when you try to make a call from the call history or if you dial a number?

It doesn't matter if i just call a number or if i use a number from the phonebook, or if i call a number from the history.. etc.

> Have you ensured that this is not an outbound rule issue?

Not sure what i should explicitly check, i mean, i just can log off and log on again with my account and everything is back to normal.

Regards
Tom

 

[TheodorosG_3CX]

The Forbidden error can be generated if for example there is no valid outbound rule but also can happen if currently there is a disconnection of the app.
Since you described that you actually re-register and is working this can be the case but i cannot confirm as this requires further investigation. I would suggest that you create a ticket to the Support Team and proceed from there.

 

[TomTheOne]

Hi Theodoros/Charles,

Thanks for your reply.

> (..) there is no valid outbound rule

We can exclude that.

> also can happen if currently there is a disconnection of the app.

I would say the same, but i'm confused why inbound calls ring on the app (?)

> I would suggest that you create a ticket to the Support Team

I think i can't get support with my Free license :-(

Regards
Tom