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### Description
When called from within an event_route[tm:branch-failure:id],
rtpengine_manage() will do an offer instead of a delete, resulting in
duplicated sdp lines in body. Is this an omission or is it intentional?
<!--
Explain what you did, what you expected to happen, and what actually happened.
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### Troubleshooting
#### Reproduction
```
event_route[tm:branch-failure:DISPATCH_PROVIDER_FAILOVER] {
rtpengine_manage("trust-address replace-origin replace-session-connection");
# next DST - only for 5xx or local timeout
if ( t_check_status("5[[:digit:]]+") || (t_branch_timeout() &&
!t_branch_replied()) ) {
if ( ds_next_dst() ) {
xlog("L_NOTICE", "--- SCRIPT_DISPATCH_PROVIDER_FAILOVER: A failover
destination was selected: Forwarding to $du\n");
t_on_branch("PROVIDER_BRANCH");
t_on_branch_failure("DISPATCH_PROVIDER_FAILOVER");
t_on_failure("NEXT_PROVIDER");
route(RELAY);
exit;
} else {
xlog("L_NOTICE", "--- DISPATCH_PROVIDER_FAILOVER: PROVIDER DOWN!
Failed to route request to provider! Giving Up. Negative response will be sent
upstream.\n");
}
}
}
```
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If the issue can be reproduced, describe how it can be done.
-->
### Possible Solutions
Explicitly use rtpengine_delete() instead.
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If you found a solution or workaround for the issue, describe it. Ideally,
provide a pull request with a fix.
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### Additional Information
* **Kamailio Version** - output of `kamailio -v`
```
version: kamailio 5.3.2 (x86_64/linux)
flags: USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE,
USE_MCAST, DNS_IP_HACK, SHM_MMAP, PKG_MALLOC, Q_MALLOC, F_MALLOC, TLSF_MALLOC,
DBG_SR_MEMORY, USE_FUTEX, FAST_LOCK-ADAPTIVE_WAIT, USE_DNS_CACHE,
USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLACKLIST, HAVE_RESOLV_RES,
TLS_PTHREAD_MUTEX_SHARED
ADAPTIVE_WAIT_LOOPS 1024, MAX_RECV_BUFFER_SIZE 262144, MAX_URI_SIZE 1024,
BUF_SIZE 65535, DEFAULT PKG_SIZE 8MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: unknown
compiled with gcc 8.3.0
```
* **Operating System**:
<!--
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16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...;
Kernel details (output of `uname -a`)
-->
```
Debian 10.3
Linux #1 SMP Debian 4.19.67-2+deb10u2 (2019-11-11) x86_64 GNU/Linux
```
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