Please below find the attachment of ngrep output when i tried to register Blink clients to the kamailio server.
mysql> select * from location;
+----+-----------------------+----------+---------------+--------------------------------+----------+------+---------------------+-------+----------------------------------+------+---------------------+-------+--------+-----------------------+-----------------------+---------+-------------------------------------------------+--------+
| id | ruid | username | domain | contact | received | path | expires | q | callid | cseq | last_modified | flags | cflags | user_agent | socket | methods | instance | reg_id |
+----+-----------------------+----------+---------------+--------------------------------+----------+------+---------------------+-------+----------------------------------+------+---------------------+-------+--------+-----------------------+-----------------------+---------+-------------------------------------------------+--------+
| 72 | uloc-526b8d87-34e7-11 | 1111 | kamailio.test |
sip:29854013@192.168.2.96:5060 | NULL | NULL | 2013-10-26 15:41:27 | -1.00 | ef1839714d7045948c98d3c050c75c39 | 2 | 2013-10-26 15:31:27 | 0 | 512 | Blink 0.5.0 (Windows) | udp:
192.168.2.41:5060 | NULL | <urn:uuid:d2256fbe-2df2-4180-9a48-547bfb76e6c5> | 0 |
| 73 | uloc-526b8d87-34e8-f | 1112 | kamailio.test |
sip:21748309@192.168.2.97:5060 | NULL | NULL | 2013-10-26 15:35:12 | -1.00 | 91d3e8bc5da742de96c2dee9c697b964 | 1 | 2013-10-26 15:25:12 | 0 | 512 | Blink 0.5.0 (Windows) | udp:
192.168.2.41:5060 | NULL | <urn:uuid:1a7ff846-cde0-4a46-8ff6-785066ed12c9> | 0 |
+----+-----------------------+----------+---------------+--------------------------------+----------+------+---------------------+-------+----------------------------------+------+---------------------+-------+--------+-----------------------+-----------------------+---------+-------------------------------------------------+--------+
2 rows in set (0.00 sec)
And also there are errors in syslog as in the attachment below.
Seems like something wrong with presence subscription.
Is it like without the presence visibility between the clients, file transfer can not be possible ?
your help will meant a lot.