### Description
Hello,
Kamailio -master version couldnt relay tcp request to other sides. it gives
EAGAIN error. When i test scenario on kamailio-5.2 version , it can relay.
### Troubleshooting
#### Reproduction
```
route[TCPTEST]{
remove_hf("Route");
#loose_route();
if (!is_method("INVITE")) return;
$du="sip: mykamailio1.test:5060;transport=tcp";
if(!t_newtran()){
xlog("L_WARN"," Couldnt create new transaction \r\n");
sl_send_reply("503", "Service not available");
exit;
}
if(!t_relay()){
send_reply("503", "Service not available");
exit;
}
exit;
}
```
#### Debugging Data
#### 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).
-->
```
7(15781) DEBUG: <core> [core/tcp_main.c:1229]: tcpconn_new(): on port 5060,
type 2
7(15781) DEBUG: <core> [core/tcp_main.c:1539]: tcpconn_add(): hashes:
507:2382:0, 2
7(15781) DEBUG: <core> [core/tcp_main.c:2873]: tcpconn_1st_send(): pending
write on new connection 0x7fd15b5e7c98 (-1/1483 bytes written) (err: 11 -
Resource temporarily unavailable)
7(15781) ERROR: <core> [core/tcp_main.c:2891]: tcpconn_1st_send():
[FD61:C23C:B3B6:0:0:0:0:5]:5060: EAGAIN and write queue full or failed for
0x7fd15b5e7c98
7(15781) DEBUG: <core> [core/tcp_main.c:3153]: tcpconn_chld_put(): destroying
connection 0x7fd15b5e7c98 (2, -1) flags 0060
7(15781) ERROR: tm [../../core/forward.h:251]: msg_send_buffer(): tcp_send
failed
```
#### SIP Traffic
<!--
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).
-->
```
UAC: IPv6: TCP ---> Kamailio (5.2) :IPv6 :TCP ---> Client or Server IPv6:TCP
```
### 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 master from git
```
* **Operating System**:
<!--
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`)
-->
```
NAME="CentOS Linux"
VERSION="7 (Core)"
3.10.0-957.1.3.el7.x86_64
```
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