### Description

when using rtp_media_server module in my kamailio configuration, the `rms_answer` function generates a "200 OK" with a hard-coded Contact header user.

I believe it would make more sense for this to use the To user (`$tU`) as that should be who is answering.

#### Reproduction

``` route { if (t_precheck_trans()) { t_check_trans(); exit; } t_check_trans();

if (is_method("INVITE") && !has_totag()) { if (!rms_answer("rms:start_long")) { t_reply("503", "server error"); } exit; }

if (rms_dialog_check()) { rms_sip_request(); } } ```

#### Debugging Data

n/a

#### Log Messages

n/a

#### SIP Traffic

``` INVITE sip:+461812345678@123.123.example.com SIP/2.0. Via: SIP/2.0/UDP 172.21.0.3:6060;branch=z9hG4bK6810d54f. Max-Forwards: 70. From: sip:+461812345677@172.21.0.3:6060;tag=as21f01093. To: sip:+461812345678@123.123.example.com. Contact: sip:+461812345677@172.21.0.3:6060. Call-ID: 4f56bf7336a114d75402e30f47013748@172.21.0.3:6060. CSeq: 102 INVITE. Allow: INVITE, ACK, CANCEL, OPTIONS, BYE, REFER, SUBSCRIBE, NOTIFY, INFO, PUBLISH, MESSAGE. Supported: replaces, timer. Content-Type: application/sdp. Content-Length: 248. .. v=0. o=root 1511071437 1511071437 IN IP4 172.21.0.3. s=Asterisk PBX 18.10.0. c=IN IP4 172.21.0.3. t=0 0. m=audio 26516 RTP/AVP 8 101. a=rtpmap:8 PCMA/8000. a=rtpmap:101 telephone-event/8000. a=fmtp:101 0-16. a=ptime:20. a=maxptime:150. a=sendrecv.

SIP/2.0 200 OK. Via: SIP/2.0/UDP 172.21.0.2;branch=z9hG4bK09e2.aa4ab6455ca95a0ee95268497e877cc4.2;rport=5060. Via: SIP/2.0/UDP 172.21.0.3:6060;rport=6060;branch=z9hG4bK6810d54f. From: sip:+461812345677@172.21.0.3:6060;tag=as21f01093. To: sip:+461812345678@123.123.example.com;tag=f46321019d9527ace4b30f86d231e4a2-cafc0000. Call-ID: 4f56bf7336a114d75402e30f47013748@172.21.0.3:6060. CSeq: 102 INVITE. Contact: sip:rms@172.21.0.4:5060. Content-Type: application/sdp. Server: kamailio (5.6.3 (aarch64/linux)). Content-Length: 99. .. v=0. o=- 1028316687 1 IN IP4 172.21.0.4. s=-. c=IN IP4 172.21.0.4. t=0 0. m=audio 51900 RTP/AVP 8. ```

### Possible Solutions

n/a

### Additional Information

* **Kamailio Version** - output of `kamailio -v`

``` version: kamailio 5.6.3 (aarch64/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-NOSMP, USE_DNS_CACHE, USE_DNS_FAILOVER, USE_NAPTR, USE_DST_BLOCKLIST, 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 12.2.0 ```

* **Operating System**:

``` debian bookworm ```