SIP Trunking Seminar

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SIP TrunkingSeminar

• Can Your PBX do That?
• October 2006

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Why is SIP Trunking so difficult ?

• Well, is it really?
• Firewall vendors still dont know SIP
• All the trouble because of NAT
• Lines vs. Trunks (do you need DID?)
• Security (to register or not to register?)
• Is it really cheaper?
• What about voice quality?
• What else can I do with this?

We understand SIP well and wrote big parts of the
standard
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The Good News It Really Works

• A SIP Proxy based IP PBX does inter-domain
  routing by default
• Use a specialized SBC or SIP aware
  Firewall(being able to transfer calls is
  important)
• Insist on certified offerings or bundles
• Remote workers and branch offices can now be
  connected too

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Lines vs. Trunks
Poor Mans Trunking Good for small deployments
Holes
508-345-1123
B2BUA
508-345-6532
508-345-9987
ITSP

• No DIDs
• Security through registration (like phones)
• Holes in your firewall
• STUN keep-alive traffic

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Deployment Example
sipX HA Call Control Server
Ingate SIParator
sipX Media Config Server

• DIDs
• Different possibilities for security (ACL, TLS,
  SIPConnect)
• No holes in your firewall stateful inspection
  of SIP traffic
• Fail-over in case route is unavailable or busy
  fully automatic
• Works with complex multi-party call flows

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Is it really cheaper?

• PSTN gateways are expensive
• Single span T1/E1 3,200
• Dual span T1/E1 4,380
• 8 span T1/E1 15,500
• Who does the best job on least cost routing?
• SIP aware firewall or SBC needed anyway for
  remote workers and branch office interconnection
• SIP Trunking can save up to 40 on CAPEX

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What About Voice Quality?

• Depends on the quality of your data connection
• Fewer format conversions improves quality
• Polycoms HD Voice supported for on-net calls
  only
• Requires proper network engineering VLAN, QoS,
  TOS
• Usually results in higher voice quality

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What else can be done with this?

• Phase 1 Call Origination and termination to and
  from the PSTN using a SIP Trunking provider
• Phase 2 Connectivity and federation between
  domains bypassing the PSTN
• Better voice quality
• Its simply cheaper
• More than voice (rich media, presence, messaging)
• Look at FMC, ENUM ISN

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Pingtel SIPxchange ECS

• SIPxchange is architected around SIP Trunking
• A 2nd Generation system with better technology
  and superior architecture
• Offering better voice quality
• IT integration without compromise
• Easiest yet to install and manage
• Up to 50 cheaper

The SIP Experts
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SIP TrunkingSeminar

• Can Your PBX do That?
• October 2006

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Todays Offerings

• Lack of standards provides for various
  definitions for SIP Trunking - Pingtel is a
  committed thought leader in the industry involved
  in defining standards
• Recent activity in the SIP Forum Technical
  Working Group the IP PBX and Service Provider
  Interoperability Task Group (http//www.sipforum
  .org/content/view/179/213) - goal is to specify
  profiles for the interface between an enterprise
  PBX and a SIP service provider.
• Pingtels Scott Lawrence is leading our
  involvement in this group - Scott is Pingtels
  lead Consulting Engineer and world-class SIP
  trunking expert Scott also serves on the IETF
  SIP WG and is a project Coordinator at
  SIPfoundry, the worlds leading open source SIP
  community Scott is a leading authority on
  routing, SIP, security, and network design
• Participation is encouraged by technical contacts
  at any SIP trunk service provider - effort will
  dramatically accelerate the adoption of SIP and
  will be a huge boost to both the PBX and services
  businesses
• Information on SIP Forum membership -
  www.sipforum.org/index.php?optioncom_contenttask
  viewid17Itemid47
• Information on IP PBX and Service Provider
  Interoperability Task Group -
  www.sipforum.org/content/view/179/213)
• In order to contribute to the Technical Working
  Group you only need individual participant
  membership, which is free

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2 Major SIP Trunk Types

• Type 1 Preferred by Pingtel Managed IP
  Connection
• SIPxchange work with these offerings today OUT OF
  THE BOX (professional services required)
• SIPxchange can use the managed network as
  primary/backup gateway
• Service provider owns the connection to the
  customer premise
• Media gateway is in the cloud aka, Managed
  Gateway Services
• User agent registration not necessary router
  needed on premise
• Known offerings currently available and in
  production
• Level 3, BBCOM, NextGenData, City Voice
• Offerings currently under development
• ATT, MCI, Time Warner, XO, T Systems

SIPxchange PBX
SIP trunk
TDM Voice trunk
Customer-supplied media gateway
IP
Max. 1,500 seats / server 30 media ports
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2 Major SIP Trunk Types (contd)

• Not preferred by Pingtel User Agent Registration
• SIPxchange WILL NOT register with these networks
  today
• These offers are focused on IP Centrex or
  Residential applications
• These offerings are not reliable and scaleable
  enough for SMB market
• User agent registers with providers proxy using
  single user credentials
• Known offerings currently available and in
  production
• Vonage, Broadvoice, ATT CallVantage
• Usually used by Asterisk users

User Agent registration
Asterisk (B2BUA)
TDM Voice trunk
Customer-supplied Digium gateway
IP
Max. 100 seats / server Bec. of B2BUA
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Other SIP Trunking Initiatives

• TLS (transport layer security proxy-to-proxy
  connection)
• Encrypts signaling using SSL
• Certificates are used to authenticate connection
• Service Provider equipment and customer prem
  equipment must both support it
• Pingtel has partially implemented and is looking
  for partners
• SIPconnect (proxy-to-proxy connection)
• All customer premise registrations are sent to
  service provider
• Service provider can manage all users
• Pingtel is evaluating
• SIP Forum is evaluating before recommending to
  IETF
• Initiative driven by vendors (e.g., CBeyond,
  Sylantro)

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Summary

• Service providers that authenticate by user
  registration will not work with SIPxchange today
• Pingtel will continue to monitor these providers
  for offerings targeted at SMB market
• Service providers that support Managed IP
  services with access control lists can be
  supported today
• Support of the channel available from Pingtel as
  Professional Service
• Pingtel is interested in partnering with service
  providers who wish to support TLS proxy-to-proxy
  service offerings
• Pingtel will continue to evaluate SIPconnect and
  work with the SIP Forum and will monitor industry
  acceptance

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Contacts

• Level 3
• Doug Widdoes, Northeast Sales Director,
  doug.widdoes_at_level3.com , [phone]
• BBCOM
• Anthony Santana, Account Manager,
  asantana_at_bbcominc.com
• NextGenData
• Terry Carpenter, tlc2_at_nextgendata.com , (484)
  334-4122
• City Voice
• Kelly Lowther, VP, kelly_at_starshipcorp.com , (603)
  659-2912 x104
• Pingtel
• Scott Lawrence, Consulting Engineer,
  slawrence_at_pingtel.com
• Neil Segall, VP Sales, nsegall_at_pingtel.com,
  781-439-5640
• Bob Pizani, Manager, Systems Engineering,
  bpizani_at_pingtel.com