osip_message_t *reg = NULL;
	int rid;
	eXosip_lock(ctx);
	char reg_uri[300];
	strcpy(reg_uri, "sip:");
	strcat(reg_uri, (char *)gtk_entry_get_text(GTK_ENTRY(username_entry)));
	strcat(reg_uri, "@");
	strcat(reg_uri, (char *)gtk_entry_get_text(GTK_ENTRY(domain_entry)));
	printf("Registration URI: %s\n", reg_uri);
	rid = eXosip_register_build_initial_register (ctx, reg_uri, (char *)gtk_entry_get_text(GTK_ENTRY(domain_entry)), NULL, 1800, &reg);

	if(rid < 0) {
		printf("Returned -1 as asked.\n");
		eXosip_unlock (ctx);
		return -1;
	}