asterisk users - Feb 2007 - realtime and save ip server in database

Hello

I change this from chan_sip.conf (see ipsvr):

static void realtime_update_peer(const char *peername, struct 
sockaddr_in *sin, const char *username, const char *fullcontact, int 
expirey)
{
         char port[10];
         char ipaddr[20];
         char regseconds[20];
         time_t nowtime;
->        char ipsvr[20];

         time(&nowtime);
         nowtime += expirey;
         snprintf(regseconds, sizeof(regseconds), "%d", (int)nowtime);
/* Expiration time */
         ast_inet_ntoa(ipaddr, sizeof(ipaddr), sin->sin_addr);
         snprintf(port, sizeof(port), "%d", ntohs(sin->sin_port));
->        ast_inet_ntoa(ipsvr, sizeof(ipsvr), sin->sin_addr);

         if (fullcontact)
                 ast_update_realtime("sippeers", "name",
peername,
"ipaddr", ipaddr, "port", port, "regseconds",
regseconds, "username",
username, "fullcontact", fullcontact, "ipsvr", ipsvr, NULL);
         else
                 ast_update_realtime("sippeers", "name",
peername,
"ipaddr", ipaddr, "port", port, "regseconds",
regseconds, "username",
username, "ipsvr", ipsvr, NULL);
}

I need put a asterisk ip address on client was registered. But I don't 
know how get this address. Exist any variable ? Any struct ?

I think, this is a good idea for add to asterisk. If I have more of one 
asterisk in realtime database, I can send call to that server where 
sipendpoint was registered.

Thanks for all !!!