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### Description

The 200OK reply to SUBSCRIBE on IPv6 has the Contact header wrong formatted, it's appear as:

Contact: sip:2222:0:0:0:0:0:0:55:4060;transport=udp

instead of

Contact: sip:[2222:0:0:0:0:0:0:55]:4060;transport=udp

<!-- Explain what you did, what you expected to happen, and what actually happened. -->

### Troubleshooting

#### Reproduction

<!-- If the issue can be reproduced, describe how it can be done. -->

#### Debugging Data

<!--

-->

``` (paste your debugging data here) ```

#### Log Messages

<!-- Check the syslog file and if there are relevant log messages printed by Kamailio, add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

``` (paste your log messages here) ```

#### SIP Traffic UBSCRIBE sip:+393498786882@ims.mnc021.mcc292.3gppnetwork.org SIP/2.0 Via: SIP/2.0/UDP [2221::5]:4060;branch=z9hG4bK-5-0-95675325205398405120;rport From: sip:+393498786882@ims.mnc021.mcc292.3gppnetwork.org;tag=5-0-63373794482729304064 To: sip:+393498786882@ims.mnc021.mcc292.3gppnetwork.org Call-ID: callid-5-0-cnt-2-23363871231378927616 Contact: sip:+393498786882@[2221::5]:4060;expires=80 Max-Forwards: 70 User-Agent: SIPv3 UeSIM LTE - vtrunk_C Allow: INVITE,ACK,BYE,CANCEL,NOTIFY,MESSAGE,OPTIONS,PRACK,UPDATE,REFER Expires: 80 Proxy-Authorization: Digest username="+393498786882@ims.mnc021.mcc292.3gppnetwork.org", realm="ims.mnc021.mcc292.3gppnetwork.org", algorithm=MD5, nonce="WIIsT1iCKyMEfQy/SmMqSl2b4P4n2vR7", uri="sip:ims.mnc021.mcc292.3gppnetwork.org", response="4e39c2ab34e4009dca083e4cbd2acebc", cnonce="59159616548176674082335766872064", qop=auth, nc=00000001 Event: presence.winfo Allow-Events: reg, presence, presence.winfo Privacy: none Accept: application/watcherinfo+xml CSeq: 76585 SUBSCRIBE Organization: Sent by UAC Transaction Layer Content-Length: 0

SIP/2.0 200 OK Via: SIP/2.0/UDP [2221::5]:4060;branch=z9hG4bK-5-0-95675325205398405120;rport=4060;received=2221:0:0:0:0:0:0:5 From: sip:+393498786882@ims.mnc021.mcc292.3gppnetwork.org;tag=5-0-63373794482729304064 To: sip:+393498786882@ims.mnc021.mcc292.3gppnetwork.org;tag=be7ce37c4413768ae7f9747982106912-651e Call-ID: callid-5-0-cnt-2-23363871231378927616 CSeq: 76585 SUBSCRIBE Expires: 80 Contact: sip:2222:0:0:0:0:0:0:55:4060;transport=udp Server: kamailio (4.4.5 (x86_64/linux)) Content-Length: 0 Warning: 392 [2222:0:0:0:0:0:0:55]:4060 "Noisy feedback tells: pid=27504 req_src_ip=2221:0:0:0:0:0:0:5 req_src_port=4060 in_uri=sip:+393498786882@ims.mnc021.mcc292.3gppnetwork.org out_uri=sip:+393498786882@ims.mnc021.mcc292.3gppnetwork.org via_cnt==1"

<!-- If the issue is exposed by processing specific SIP messages, grab them with ngrep or save in a pcap file, then add them next, or attach to issue, or provide a link to download them (e.g., to a pastebin site). -->

``` (paste your sip traffic here) ```

### Possible Solutions

<!-- If you found a solution or workaround for the issue, describe it. Ideally, provide a pull request with a fix. -->

### Additional Information * **Kamailio Version** - output of `kamailio -v`

version: kamailio 4.4.5 (x86_64/linux) flags: STATS: Off, USE_TCP, USE_TLS, USE_SCTP, TLS_HOOKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, 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 ADAPTIVE_WAIT_LOOPS=1024, MAX_RECV_BUFFER_SIZE 262144, MAX_LISTEN 16, 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 4.9.2

``` (paste your output here) ```

* **Operating System**:

Distributor ID: Debian Description: Debian GNU/Linux 8.7 (jessie) Release: 8.7 Codename: jessie

<!-- Details about the operating system, the type: Linux (e.g.,: Debian 8.4, Ubuntu 16.04, CentOS 7.1, ...), MacOS, xBSD, Solaris, ...; Kernel details (output of `uname -a`) -->

``` (paste your output here) ```