[sr-dev] [kamailio/kamailio] No reply on dispatcher ping with asterisk 16.10.0 (#2320)

[Alvaro Mazuera]

Hi, I am implementing a sip proxy with kamailio and multiple asterisk servers, when kamailio send the OPTIONS asterisk don´t reply, and i see with sngrep tool that in the asterisk servers the SIP message OPTIONS arrives, but has no reply from asterisk, and enabling the sip debug nothing occurs, but the OPTIONS message between asterisk servers is all ok.

On kamailio logs get:

dispatcher [dispatch.c:3159]: ds_options_callback(): OPTIONS-Request was finished with code 408 (to sip:172.20.20.4, group 1)

The SIP traffic arrives the asterisk servers, but asterisk don´t reply the message, (I know this because i can see it with the sngrep tool, because the sip debug on asterisk doesn't show it) . However when the message is from another asterisk all is ok.

Sip kamailio OPTIONS message on asterisk 
```
OPTIONS sip:172.20.20.3 SIP/2.0
Via: SIP/2.0/UDP 172.16.10.195;branch=z9hG4bKef0b.b1358
To: <sip:172.20.20.3>
From: <sip:kamailio at 172.20.20.6>;tag=3393f0703fb0ccaca7
09ff37de39f5-b7044ca5
CSeq: 10 OPTIONS
Call-ID: 791b966c5d00cd60-24281 at 127.0.0.1
Max-Forwards: 70
Content-Length: 0
User-Agent: kamailio (5.3.4 (x86_64/linux))
```

### Additional Information

```
version: kamailio 5.3.4 (x86_64/linux) 117ff9
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: 117ff9
compiled on 13:37:37 May  6 2020 with gcc 8.2.1
```


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