SIP Registration from PHP Script

Question

The Goal: to use a LAMP server to register as and endpoint to a SIP server.

Why: To intercept phone calls to a particular extension as they happen to interact with a PHP CRM.

The SIP server is not using Asterisk as has to be made generic enough to handle any SIP service.

I'm using a handy PHP SIP Library written by Level7Systems - Although there isn't many examples or support on this particular package.

My code is:

  $api1 = new PhpSIP('x.x.x.x'); //My Servers public IP
  $api1->setMethod('REGISTER');
  $api1->setFrom('sip:111@my-dns.com');
  $api1->setUri('sip:111@sip-server.com');

  $api1->setUsername('12345');
  $api1->setPassword('abc123');
  $res = $api1->send(); 

The code executes successful, creates a socket (and a lock file), binds to a port and supposedly sends a UDP packet to the SIP server... Although, when I run a tcpdump I don't see any UDP packets hitting port 5060 or 5061 to the destination server.

The code will run for 10 seconds while it waits for a reply from the SIP server as it should return with an 404 response. But it never does.

To be sure, I've also disabled my firewall.

Anyone had any experience registering a SIP endpoint using PHP?

Is there a better way to do it?

Answer 1

my suggestion is to add a try...catch to see what happens in your routine.

try {
  $api1 = new PhpSIP('x.x.x.x'); //My Servers public IP
  $api1->setMethod('REGISTER');
  $api1->setFrom('sip:111@my-dns.com');
  $api1->setUri('sip:111@sip-server.com');

  $api1->setUsername('12345');
  $api1->setPassword('abc123');
  $res = $api1->send();

  echo "res: $res\n";

} catch (Exception $e) {

  echo $e->getMessage()."\n"; } 

But, if you are using SIP phones, another solution is to try with the action URL / active URI. Here a good guide to understand how to use them.

Answer 2

So it turned out that @sip-server.com wasn't actually an active SIP server.

It was more like @sip.sip-server.com that needed to be pinged, and once that change happened, everything worked as expected.

Thanks.