Ozzyboshi created an issue (kamailio/kamailio#4743)
### Description
While testing tel2sip(), I observed that the function may return success (1)
even when the generated SIP URI is not valid and cannot be parsed by internal
parsing functions such as parse_uri().
After validating the input parameters, tel2sip() constructs the resulting SIP
URI but does not perform any validation on the final output before returning
success.
This can lead to inconsistent behavior in later routing stages, where the
malformed URI is used assuming it is valid.
### Reproduction
The issue can be reproduced with the following snippet (e.g. in request_route):
```
$var(tmp) = "tel:[email protected];user=phone";
$var(tmp_domain) = "10.10.151.23";
tel2sip("$var(tmp)", "$var(tmp_domain)", "$var(tmp)");
xlog("L_NOTICE", "tel2sip launched with «$var(tmp)» and domain
«$var(tmp_domain)» returned $retcode\n");
```
This produces output similar to:
```
tel2sip launched with
«sip:playcfannounce@217159599;[email protected];user=phone» and domain
«10.10.151.23» returned 1
```
The function returns 1 (success) even though the resulting SIP URI is malformed
The generated URI is not valid and cannot be parsed correctly
What I would expect:
- The function should return an error (-1)
- the function should ensure the generated URI is parsable before returning
success
### Additional Information
```
lsb_release -a
Linux sp2 6.12.85+deb13-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.85-1
(2026-04-30) x86_64 GNU/Linux
root@sp2:~# lsb_release -a
No LSB modules are available.
Distributor ID: Debian
Description: Debian GNU/Linux 13 (trixie)
Release: 13
Codename: trixie
```
### Operating System:
```
uname -a
Linux sp2 6.12.85+deb13-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.85-1
(2026-04-30) x86_64 GNU/Linux
```
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https://github.com/kamailio/kamailio/issues/4743
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