truct ast_netsock *ast_netsock_bindaddr(struct ast_netsock_list *list, struct io_context *ioc, struct sockaddr_in *bindaddr, int tos, ast_io_cb callback, void *data)
{
	int netsocket = -1;
	int *ioref;
	char iabuf[INET_ADDRSTRLEN];
	
	struct ast_netsock *ns;
	
	/* Make a UDP socket */
	netsocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_IP);
	
	if (netsocket < 0) {
		ast_log(LOG_ERROR, "Unable to create network socket: %s\n", strerror(errno));
		return NULL;
	}
	if (bind(netsocket,(struct sockaddr *)bindaddr, sizeof(struct sockaddr_in))) {
		ast_log(LOG_ERROR, "Unable to bind to %s port %d: %s\n", ast_inet_ntoa(iabuf, sizeof(iabuf), bindaddr->sin_addr), ntohs(bindaddr->sin_port), strerror(errno));
		close(netsocket);
		return NULL;
	}
	if (option_verbose > 1)
		ast_verbose(VERBOSE_PREFIX_2 "Using TOS bits %d\n", tos);

	if (setsockopt(netsocket, IPPROTO_IP, IP_TOS, &tos, sizeof(tos))) 
		ast_log(LOG_WARNING, "Unable to set TOS to %d\n", tos);

	ast_enable_packet_fragmentation(netsocket);

	ns = malloc(sizeof(struct ast_netsock));
	if (ns) {
		/* Establish I/O callback for socket read */
		ioref = ast_io_add(ioc, netsocket, callback, AST_IO_IN, ns);
		if (!ioref) {
			ast_log(LOG_WARNING, "Out of memory!\n");
			close(netsocket);
			free(ns);
			return NULL;
		}	
		ASTOBJ_INIT(ns);
		ns->ioref = ioref;
		ns->ioc = ioc;
		ns->sockfd = netsocket;
		ns->data = data;
		memcpy(&ns->bindaddr, bindaddr, sizeof(ns->bindaddr));
		ASTOBJ_CONTAINER_LINK(list, ns);
	} else {
		ast_log(LOG_WARNING, "Out of memory!\n");
		close(netsocket);
	}

	return ns;
}