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<title>libeXosip2: How-To send or update registrations.</title>
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<h1>How-To send or update registrations.<br>
<small>
[<a class="el" href="group__libeXosip2.html">The eXtented eXosip stack</a>]</small>
</h1><table border="0" cellpadding="0" cellspacing="0">
<tr><td></td></tr>
</table>
eXosip2 offers a flexible API to help you to register one or several identities.<p>
<h2>Initiate a registration</h2>
<p>
To start a registration, you need to build a default REGISTER request bby providing several mandatory headers<p>
<pre>
osip_message_t *reg = NULL;
int id;
int i;</pre><p>
<pre> eXosip_lock ();
id = eXosip_register_build_initial_register (identity, registrar, NULL,
1800, &reg);
if (id < 0)
{
eXosip_unlock ();
return -1;
}</pre><p>
<pre> osip_message_set_supported (reg, "100rel");
osip_message_set_supported(reg, "path");</pre><p>
<pre> i = eXosip_register_send_register (id, reg);
eXosip_unlock ();
return i;</pre><p>
<pre></pre><p>
The returned element of eXosip_register_build_initial_register is the registration identifier that you can use to update your registration. In future events about this registration, you'll see that registration identifier when applicable.<p>
<h2>Update a registration</h2>
<p>
You just need to reuse the registration identifier:<p>
<pre>
int i;</pre><p>
<pre> eXosip_lock ();
i = eXosip_register_build_register (id, 1800, &reg);
if (i < 0)
{
eXosip_unlock ();
return -1;
}</pre><p>
<pre> eXosip_register_send_register (id, reg);
eXosip_unlock ();
</pre><p>
<b>Note</b>: The above code also shows that the stack is sometimes able to build and send a default SIP messages with only one API call<p>
<h2>Closing the registration</h2>
<p>
A softphone should delete its registration on the SIP server when terminating. To do so, you have to send a REGISTER request with the expires header set to value "0".<p>
The same code as for updating a registration is used with 0 instead of 1800 for the expiration delay. </div>
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