B715 & CS Voice with outgoing calls work badly

Dear user,
Thanks for reaching out to us. We are sorry for the inconvenience caused. Since you are visiting our Enterprise product page, we would suggest a visit to our page dedicated to personal devices to better solve this question.
We have the Huawei Community support (https://consumer.huawei.com/en/community/list/?forumId=10014) where you can get the answer online, and also the service hotline for each country or region. You can get the regional hotline number via https://consumer.huawei.com/en/support/hotline.

Hi user:

Handling Process:
1) we asked customer to check the other operators with the same Extension and he confirmed that the calls are done successfully for the other operators with no issue
2) we asked customer to check if there are any firewalls which may be blocked the media packets but he said no
3) we asked customer to check with the operator he told us that operator proved that they
4) we asked customer to make two calls ; the first call from the operator which working fine and the other one for operator which is not working and collect the U1981 logs to check
5) we compared the call logs of the two calls and found the below

- For the successfull call with signalling and media coming from the operator we found that the call signalling is fine with no issues as below
Root Cause:
after Operator side send 183 to u19, it sent 180 again, it needs to configure the softargu 393 value to 0 to avoid this issue.customer did not configure this
Solution:
not allow SIP trunk with operator to  process 180 after 18X with SDP as below command

config softargu type 393 value 0

https://support.huawei.com/enterprise/en/knowledge/EKB1100017053

Hi Unicef,
the issue that you posted it concerns about a SIP call issue. In my case it concerns a CS Voice call issue with a SIM card inserted into device.
There are two different mode to call, SIP and CS Voice and they are different. I'm looking for a CS Voice issue solution, not SIP solution.
Thank you.

Hi Ernesto_cupet6,
I looked for my problem but I haven't found a solution.

My regional hotline can't give me a solution, they don't know the source of the problem.

Thank you.

I think you should contact your seller, if they can not give you a good solution, then there may be a problem with the router, and they should give you a new one.

Today I have called the support. The woman that have answer me have hang down the phone. Nice support!
No ticket, no support.

It isn't a router failure, There are many models that have the same issue, someone, like B525, work perfectly!
My seller cannot solve this issue with a new one!
I think that only a firmware o setting fix can solve this issue.

Dear Wlf46!
I found the following link for you. You can check your local Huawei customer service hotline. Huawei customer service will solve it for you.
https://consumer.huawei.com/en/support/service-center/  

Thank you!

The link that you posted is the same of this post, it's a loop link!