06.Michael HABERLER - etsi-eptf.ppt
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    06.Michael HABERLER - etsi-eptf.ppt 06.Michael HABERLER - etsi-eptf.ppt Presentation Transcript

    • Setup of ENUM-based services: The Generic Gateway Reference Implementation Michael Haberler Internet Foundation Austria 11/2004
    • outline
      • about us
      • problem & the basic techniques
      • call flows for voice + SMS
      • description of reference implementation
      • application example: virtual number resale
      • lessons learned
      • survey of available components/suggestions for trying things out
    • us & our role
      • Internet Foundation Austria
        • Goal – fostering the Internet development in Austria
        • subsidiaries:
          • nic.at GmbH – handling .at TLD – 400.000 domains, 35 people
          • enum.at GmbH – Tier1 registry for +43 e164.arpa until 2007
          • concluded operations contract for +43 with Austrian regulator in 8/2004
            • developed ENUM registry from scratch
            • startup of full service scheduled for Dec 9, 2004
          • ipCom GmbH (in startup) – will provide:
            • Tier2 portal
            • ITSP supply services – PSTN/IP gateway, SMS/IM
            • goal is to develop the market by transferring R&D to services
      • 5 people, 2+ years ENUM trial, platform development + operations experience
    • Internet & PSTN call legs sip:anne@isp.at +43 780 1234 sip:bert@isp.de +43 780 5678 +43 1 5261670 +31 20 12345 ENUM DNS Media Gateway
    • The generic gateway trick
      • The problem is getting services out of PSTN onto IP – other direction is usually easy. Use ENUM to figure out where the endpoint is.
      • Igredients:
        • Take any service addressed by E.164 numbers. (voice, SMS, IM, presence, Video..) for which you can provide a gateway.
        • Get a number range for IP endpoints.
        • Get relevant telcos to handover service to gateway (ISDN, SS7, SMPP, 3G-324, whatever).
        • Create compatible IP endpoints with URI‘s, assign E.164 numbers & ENUM domains
        • ENUM lookup drives gateway, service delivery.
      • Result: soft & user-configured gateway service.
    • Generic Gatway example: Voice Telekom PSTN Switch nic.at43.at 1. +43 780 123456 6.5.4.3.2.1.0.8.7.3.4.e164.arpa 4. sip:mah@nic.at43.at sip:mah@nic.at43.at 5. INVITE sip:mah@nic.at43.at PSTN-IP Gateway 2. +43 780.* 6. INVITE sip:mah@nic.at43.at PSTN Internet
    • Generic Gateway example: SMS delivery MO SMS Center nic.at43.at 6.5.4.3.2.1.0.8.7.3.4.e164.arpa 4. sip:mah@nic.at43.at sip:mah@nic.at43.at 5. MESSAGE sip:mah@nic.at43.at at43 SMPP Server 2. SMS via SMPP 6. MESSAGE sip:mah@nic.at43.at PSTN Internet 1. SMS an +43 780 123456
    • the enum.at generic gateway reference implementation (voice)
      • covers PSTN->IP
      • does SIP, H.323 and ifax:mailto based on ENUM (public or private)
        • functionality based on service set agreed in +43 intercarrier working group
      • uses ISDN PRI (now)
      • harmless investment – 2 Cisco AS5XX0s and 2 servers will do - fully redundant
      • will scale, work and get service out
      • things it doesnt do:
        • codecs Cisco doesnt like (yet)
        • easy handling of several number ranges
        • announcement text free of charge (TBD)
    • Generic Gateway Architecture
    • Hardware/Software Cisco GW
      • at least one PRA interface and one Fast Ethernet interface
      • at least one voice feature card (vfc) module installed (DSPs for VoIP).
      • Cisco IOS version
        • IOS (tm) 5300 Software (C5300-JS-M), Version 12.2(13)T3, RELEASE SOFTWARE (fc2)
      • Fax onramp application
        • fax_on_vfc_onramp_ap
    • Hardware/Software Helper PC
      • Standard x86 compatible server hardware
      • Operating system: Debian woody 3.0r2 Linux
      • Radiator (or any other radius server which supports execution of perl scripts and database accounting)
      • Perl (included in Debian distribution)
      • Perl enum.pm module from http://jprs.co.jp/enum/software/ENUM.pm
      • postgresql database (for storing accounting data, included in Debian)
      • exim SMTP server (for delivery of fax emails, included in Debian)
      • procmail (for email handling, included in Debian)
      • dnsproxy from http://www.wolfermann.org/dnsproxy.html with modifications to rewrite “old-style” NAPTRs.
      • tftpd server (included in Debian)
    • application example: virtual number wholesale
      • virtual presence in a location is an issue (not just for offshore tax-shelters ;)
      • there‘s a wholesale market starting
      • basically number -> SIP URI mapping
      • around 1$/month wholesale
      • straightforward to implement with number range, generic gateway and ENUM registrar
    • virtual number resale: +43 case generic gateway operated by telco +43 780 ENUM-driven number range ENUM registrar operating contract ENUM subscriber ITSP offering virtual numbers subscription + VoIP service wholesale contract provisioning protocol delegation lookup
    • virtual number resale: benefits
      • telco: one gateway, any service, any business case
      • registrar: potentially popular service, especially in countries with large expatriate communities
      • user: can use number on-net too besides being reachable from PSTN
      • this is what is under construction in Austria (available Q1/2005)
    • what we would do different if we were grown up
      • have an SS7/ISUP translator driving the MG with SIGTRAN
      • look into VoIP/GSM roaming (see BridgePort MVNO/SIP gateway)
      • to do list:
        • SMS/sms:sip/sms:mailto gateway (just about ready)
        • generalized enum rewriting (so much about standards compliant hardware)
        • generalized stack activation
    • this is an open source product
      • watch www.enum.at or drop me an email
    • what we are investigating/playing with
      • we‘re building a generic gateway for SMS for at43 and then +43 780
          • sms:sip - map onto SIP MESSAGE, fallback to sms:mailto
      • mobile operators converge on the „Wireless Village“ IM & presence protocol. This is an URI, and thus an ENUM opportunity. Look at www.webmessenger.com .
      • an ENUMservice for Jabber (IDA)
      • The way Push-to-Talk is implemented is asking for Internet extension.
      • we‘re looking into a UMTS Video-> SIP H.263 gateway service with ENUM mapping.
    • recommended links for hands-on experience
      • Basic SIP-based VoIP, Instant Messenging, Presence:
        • get an account at www . fwdnet . org
        • try the Windows Eyebeam SIP client – www . xten . com
        • try instant messenging with SIP and the Windows Messenger
          • note this is not the same as Microsoft Messenger!
        • Linux: try Linux kphone http:// www . wirlab . net / kphone /
        • good information source on VoIP: http://www.voip-info. org
      • Ready for your own SIP server?
        • try SIP Express Router – www . iptel . org
        • try the Asterisk IP PBX – www . asterisk . org
        • both are ENUM enabled out-of-the-box
      • try the ENUM resolver at http://jprs.co.jp/enum/software/software. html
      • to read up on ENUM, try http://enum.nic.at