ghost calls to cid:XXXXX

[bfcoi974]

(06-17-2022 05:36 PM)complex1 Wrote:  

(06-17-2022 03:52 PM)bfcoi974 Wrote:  Hello everyone,

After several researchs, I'm really stucked with my issue.
Here is my situation :
I have some T42U phones, which replaces older cisco phones.
Once the phone is installed, this one started making some random calls to a strange format : cid:XXXXXXXX with error on screen (failed to call).
First it makes calls every random times (cf : histo1.png)
So after delete the extension in the pbx, upgrade firmware on phone then apply options for ghost call both in cgf file, the phone makes calls every 50 minutes. (cf : histo2.png)
This behaviour makes users confused because they think they are giving or receiving calls but they phone don't ring.
Thanks for your help.

Hi,

It looks like some-one/thing is trying to hack your phone(s)

Please take next steps...
1. Reset the phone(s) to factory default
2. Make sure the user account does not have the default password
3. Disable IP Call feature:
Features > General Information > Allow IP Call: Disabled
Or by auto provisioning parameter:

Code:

features.direct_ip_call_enable = 0

4. Enable SIP trust feature:
Features > General Information > Accept SIP Trust Server Only: Enabled
Or by auto provisioning parameter:

Code:

sip.trust_ctrl = 1

Hello @complex1

Thanks for your reply.
I made all changes you mentionned.
But on one phone it still have call every 50 minutes.
Please check the attachment.
Thanks for your help.