Further update, it looks like append_branch is over-writing the original request-uri, an ngrep shows the following for the 2 messages sent:

This one looks like the proper replicate for the original request

U 2014/07/21 14:56:29.781372 BACKUP_REGISTRAR_1:5060 -> BACKUP_REGISTRAR_3:5060
REGISTER sip:domain.com;transport=UDP SIP/2.0

This one looks like the r-uri is re-written to that of the BACKUP_REGISTRAR_2 address, but destination is still BACKUP_REGISTRAR_3

U 2014/07/21 14:56:33.781441 BACKUP_REGISTRAR_1:5060 -> BACKUP_REGISTRAR_3:5060
REGISTER sip:BACKUP_REGISTRAR_2:5060 SIP/2.0

Is this normal operation or am I missing something fundamental here with t_replicate/append_branch?

Thanks
Bruce

On 21/07/2014 14:24, Bruce McAlister wrote:

Just an update on this, it appears to send 2 REGISTER requests in parellel to BACKUP_REGISTRAR_3, so it looks like the append_branch is being added but its uri is set to BACKUP_REGISTRAR_3 (and not BACKUP_REGISTRAR_2 as requested int the append_branch section)

On 21/07/2014 13:49, Asgaroth wrote:

Hi All,

I have an issue that I cant seem to get to the bottom of, I would appreciate if someone could point me in the right direction.

I have 3 registrar's and would like to replicate the registration regest from 1 to the other 2, I am trying this with t_replicate, the docs say that to send to multiple destinations an append_branch should be performed prior to the t_replicate, which is what I am trying to do.

What appears to happen is that the replication only sends the REGISTER to the server defined in the t_replicate command, it doesnt appear to be sending it to the destination defined in append_branch.

Kamailio Version:

version: kamailio 4.1.4 (x86_64/linux) 84c1ff
flags: STATS: Off, USE_TCP, USE_TLS, TLS_HOOKS, USE_RAW_SOCKS, DISABLE_NAGLE, USE_MCAST, DNS_IP_HACK, SHM_MEM, SHM_MMAP, PKG_MALLOC, DBG_QM_MALLOC, 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 4MB
poll method support: poll, epoll_lt, epoll_et, sigio_rt, select.
id: 84c1ff
compiled on 14:36:04 Jul 20 2014 with gcc 4.4.7

Here is what I have tried so far (on registrar 1):

#!define BACKUP_REGISTRAR_1 '1.1.1.1'
#!define BACKUP_REGISTRAR_2 '1.1.1.2'
#!define BACKUP_REGISTRAR_3 '1.1.1.3'

save("location");
if ( src_ip != BACKUP_REGISTRAR_2 && src_ip != BACKUP_REGISTRAR_3 ) {
     append_branch("sip:" + BACKUP_REGISTRAR_2 + ":5060");
     t_replicate("sip:" + BACKUP_REGISTRAR_3 + ":5060");
};

With the above in place, I only see the system attempting to replicate to BACKUP_REGISTRAR_3, I dont see any request to BACKUP_REGISTRAR_2.

Am I doing something wrong here?

Thanks
Bruce