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Setup of ENUM-based services: The Generic Gateway Reference Implementation

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

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Setup of ENUM-based services: The Generic Gateway Reference Implementation

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  1. Setup of ENUM-based services:The Generic Gateway Reference Implementation Michael Haberler Internet Foundation Austria 11/2004

  2. 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

  3. 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

  4. Internet & PSTN call legs sip:anne@isp.at +43 780 1234 Media Gateway +43 1 5261670 ENUM DNS +31 20 12345 sip:bert@isp.de +43 780 5678

  5. 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.

  6. Generic Gatway example:Voice PSTN Internet 6.5.4.3.2.1.0.8.7.3.4.e164.arpa 4. sip:mah@nic.at43.at 2. +43 780.* 5. INVITE sip:mah@nic.at43.at Telekom PSTN Switch PSTN-IP Gateway nic.at43.at 1. +43 780 123456 6. INVITE sip:mah@nic.at43.at sip:mah@nic.at43.at

  7. Generic Gateway example:SMS delivery PSTN Internet 6.5.4.3.2.1.0.8.7.3.4.e164.arpa 4. sip:mah@nic.at43.at 2. SMS via SMPP 5. MESSAGE sip:mah@nic.at43.at MO SMS Center at43 SMPPServer nic.at43.at 6. MESSAGE sip:mah@nic.at43.at 1. SMS an +43 780 123456 sip:mah@nic.at43.at

  8. 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)

  9. Generic Gateway Architecture

  10. 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

  11. 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)

  12. 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 withnumber range, generic gateway andENUM registrar

  13. virtual number resale: +43 case ENUM registrar ITSP offering virtual numbers wholesale contract provisioning protocol delegation subscription + VoIP service operating contract ENUM lookup generic gateway operated by telco subscriber +43 780 ENUM-driven number range

  14. 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)

  15. 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

  16. this is an open source product • watch www.enum.at or drop me an email

  17. 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.

  18. 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

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