Using DNS procedures to locate SIP servers

The Session Initiation Protocol (SIP) can use Domain Name Server (DNS) procedures for a client to resolve a SIP Uniform Resource Identifier (URI).

About this task

WebSphere Application Server provides support for theRFC 3263 standard. This allows a SIP URI to be resolved through DNS into the IP address, port, and transport protocol of the next hop to contact.
Note: SIP does not support use of DNS procedures for a server to send a response to a back-up client if the primary client fails.

Complete these steps to configure WebSphere Application Server to support the RFC 3263 standard.

Procedure

  1. Start WebSphere Application Server.
  2. From the administrative console, expand Servers, and click Application servers > serverName .
  3. From Container settings, expand SIP container settings, and then click SIP container.
  4. From Additional Properties, select Custom properties > New. Type a value in the required fields.
    • Name is the name of the custom property. You must enter SIP_RFC3263_nameserver in this field.
    • Value is the address of the name server the application server will use to resolve SIP URIs. This value is represented as a string containing exactly one or two address and port tuples, where two tuples are separated by a space. The following address and port combinations make up a tuple.
      • dottedDecimalAddress@port
      • hostname.domain@port
      • IPV6address@port
      The following example values represent a single tuple.
      • 1.2.3.4@53
      • example.com@53
      • a:b:c::d@53
      The following example values represent two tuples separated by a space.
      • 1.2.3.4@53 example.com@53
      • a:b:c::d@53 9.32.211.14@53
  5. Click Apply to save your changes.
  6. Restart WebSphere Application Server.

What to do next

You must configure your DNS server in order for RFC 3263 support to work for the SIP container. The following example is a BIND db file for configuring RFC 3263 support on a DNS server.

; Copyright (C) 2004  Internet Systems Consortium, Inc. ("ISC")
; Copyright (C) 2001  Internet Software Consortium.
;
; Permission to use, copy, modify, and distribute this software for any
; purpose with or without fee is hereby granted, provided that the above
; copyright notice and this permission notice appear in all copies.
;
; THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
; REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
; AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
; INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
; LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
; OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
; PERFORMANCE OF THIS SOFTWARE.

; $Id: include.db,v 1.2.206.1 2004/03/06 10:22:13 marka Exp $

; Test $INCLUDE current domain name and origin semantics

example.com. 43200 IN SOA ns.example.com. email.example.com. ( 2003032001 10800 3600 604800 86400 )
;
example.com.             43200 IN NS      ns.example.com.
;
ns.example.com.          43200 IN A       10.0.0.20
sipserver1.example.com.  43200 IN A       10.0.0.21
sipserver2.example.com.  43200 IN A       10.0.0.22
sipserver3.example.com.  43200 IN A       10.0.0.23
;
router.example.com.        43200  IN CNAME sipserver3
;
sipserver1.example.com.  43200 IN AAAA    fec0:0:0:0:0:0:0:abcd
sipserver2.example.com.  43200 IN AAAA    fec0:0:0:0:0:0:0:abba
;
_sip._udp.example.com.   43200 IN SRV 2 0 5060  sipserver1.example.com.
_sip._udp.example.com.   43200 IN SRV 2 0 5060  sipserver2.example.com.
_sip._tcp.example.com.   43200 IN SRV 1 4 5060  sipserver1.example.com.
_sip._tcp.example.com.   43200 IN SRV 1 2 5060  sipserver2.example.com.
_sips._tcp.example.com.  43200 IN SRV 0 1 5061  sipserver1.example.com.
_sips._tcp.example.com.  43200 IN SRV 0 0 5061  sipserver2.example.com.
;
example.com. 43200 IN NAPTR 0 0 "s" "SIPS+D2T" "" _sips._tcp.example.com.
example.com. 43200 IN NAPTR 1 0 "s" "SIP+D2T"  "" _sip._tcp.example.com.
example.com. 43200 IN NAPTR 2 0 "s" "SIP+D2U"  "" _sip._udp.example.com.



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Last updatedLast updated: Aug 31, 2013 1:23:07 AM CDT
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