Quesion on SMS Gateway

[Ravi]

Hi, I have some more question related to the connection between bearerbox and SMSC, the questions are :   (i) At what port bearer box listen to the request from SMSC, and how SMSC knows about that port ? (ii) In smskannel.conf file group = smsc smsc = smpp host = 123.123.123.123 port = 600 receive-port = 700 system-id = "STT" smsc-password = foo system-type = "VMA" address-range = ""   we have two different port, onw is  port and the other is receive port. Are they belong to the SMSC (machine on which SMSC running)? If yes then why two different port to connect to the SMSC.I have also seen the code : file smsc_smpp.c in which we are using two different call to connect to the SMSC : /* Open the transmitter connection */ smsc->fd_t = tcpip_connect_to_server(smsc->hostname, smsc->port); if(smsc->fd_t == -1) goto error; smsc->smpp_t_state = SMPP_STATE_CONNECTED;  /* Open the receiver connection */ smsc->fd_r = tcpip_connect_to_server(smsc->hostname, smsc->receive_port); if(smsc->fd_r == -1) goto error; smsc->smpp_r_state = SMPP_STATE_CONNECTED; I didn't understand why do we need two different call to connect to the SMSC. please reply at your earliest. Thanks Ravi Ravishankar Tiwari Opsol Integrators Inc (408) 364 9915 ext-87 (408) 364 9916