### Description
We are trying to perform an outbound call through kamailio (5.6). When doing
so, we are getting an expected 407 response from the trunk provider. As reponse
we try to authenticate. This last invite being sent from kamailio to the trunk
provider contains a bad content-length field.
if the content header field value was 1234 in the original invite, the last
ones content-header field value is 12341234. So it looks like it's not cleared
before its set.
### Troubleshooting
this source we used to troubleshoot:
xlog("L_WARN", "TRUNKAUTH entered, message: $mbu\n"); AT THIS POINT
CONTENT_HEADER = 1234 (just an example)
if(t_check_status("401|407")) {
$avp(auser) = "testuser";
$avp(apass) = "credshere";
uac_auth();
xlog("L_WARN", "TRUNKAUTH Auth done, updated message: $mbu\n"); AT THIS
POINT CONTENT_HEADER = 12341234
route(RELAY);
#### Reproduction
See troubleshooting
### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
kamailio 5.6.2 (x86_64/linux)
```
* **Operating System**:
```
kamailio 5.6.2 (x86_64/linux)
```
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https://github.com/kamailio/kamailio/issues/3275
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