15 Feb
2018
15 Feb
'18
8:01 p.m.
### Description
I'm trying to set call redirection to another sip server.
But now i receive only error. Check reproduction and logs section.
On client side: in softphone i try to call: `z#8888`
### Troubleshooting
From server's ssh:
```
root@serv:~# ping sip.zadarma.com
PING sip.zadarma.com (185.45.152.174) 56(84) bytes of data.
64 bytes from sipbalancer-2.fr.zadarma.com (185.45.152.174): icmp_seq=1 ttl=59 time=0.746
ms
64 bytes from sipbalancer-2.fr.zadarma.com (185.45.152.174): icmp_seq=2 ttl=59 time=0.839
ms
64 bytes from sipbalancer-2.fr.zadarma.com (185.45.152.174): icmp_seq=3 ttl=59 time=0.852
ms
64 bytes from sipbalancer-2.fr.zadarma.com (185.45.152.174): icmp_seq=4 ttl=59 time=0.827
ms
^C
```
#### Reproduction
In my `kamailio.cfg`:
```
...
request_route {
if($rU=~"^(z\#)[0-9][0-9]{1,20}$"){
# get normal DestNum without prefix
$var(nuu) = $(var(nu){s.strip,2});
#set FROM Caller ID /TEST/
# @TODO: Set from callerID HERE
$fU = "74951277197";
# new sip uri
$ru = "sip:" + $var(nuu) + "(a)sip.zadarma.com".com";
route(RELAY);
}
...
```
#### Log Messages
kamailio.log:
```
Feb 15 21:30:13 serv /usr/sbin/kamailio[20999]: ERROR: <core> [core/resolve.c:1710]:
sip_hostport2su(): could not resolve hostname: "(a)sip.zadarma.com"
Feb 15 21:30:13 serv /usr/sbin/kamailio[20999]: ERROR: tm [ut.h:309]: uri2dst2(): failed
to resolve "(a)sip.zadarma.com"
Feb 15 21:30:13 serv /usr/sbin/kamailio[20999]: ERROR: tm [t_fwd.c:1735]:
t_forward_nonack(): failure to add branches
Feb 15 21:30:13 serv /usr/sbin/kamailio[20999]: ERROR: sl [sl_funcs.c:362]:
sl_reply_error(): stateless error reply used: Unresolvable destination (478/SL)
```
same in syslog:
```
Feb 15 21:30:13 serv /usr/sbin/kamailio[20999]: ERROR: <core> [core/resolve.c:1710]:
sip_hostport2su(): could not resolve hostname: "(a)sip.zadarma.com"
Feb 15 21:30:13 serv /usr/sbin/kamailio[20999]: ERROR: tm [ut.h:309]: uri2dst2(): failed
to resolve "(a)sip.zadarma.com"
Feb 15 21:30:13 serv /usr/sbin/kamailio[20999]: ERROR: tm [t_fwd.c:1735]:
t_forward_nonack(): failure to add branches
Feb 15 21:30:13 serv /usr/sbin/kamailio[20999]: ERROR: sl [sl_funcs.c:362]:
sl_reply_error(): stateless error reply used: Unresolvable destination (478/SL)
```
### Additional Information
System:
```
Distributor ID: Ubuntu
Description: Ubuntu 16.04.3 LTS
Release: 16.04
Codename: xenial
```
kernel:
```
Linux server.com 4.4.0-67-generic #88-Ubuntu SMP Wed Mar 8 16:34:45 UTC 2017 x86_64 x86_64
x86_64 GNU/Linux
```
Kamailio version:
```
version: kamailio 5.1.1 (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 5.3.1
```
Kamailio is running on ports:
```
tcp:5060
udp:5060
tls: 20060
tcp: 20059
```
### Thoughts
Maybe i have some mistakes in my kamailio config? Or something with DNS lookup permissions
for kamailio?
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