SIP Trunking Seminar
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Transcript of SIP Trunking Seminar
SIP TrunkingSeminar
Can Your PBX do That?October 2006
2Pingtel ConfidentialMay 3, 2005
Why is SIP Trunking so difficult ?
• Well, is it really?
-Firewall vendors still don’t 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
3Pingtel ConfidentialMay 3, 2005
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
4Pingtel ConfidentialMay 3, 2005
Lines vs. Trunks
B2BUA
SIP
SIP
SIP
SIP
SIP
SIP
ITSP
508-345-1123
508-345-6532
508-345-9987
Poor Man’s Trunking – Good for small deployments
Holes
• No DIDs• Security through
registration (like phones)• Holes in your firewall• STUN keep-alive traffic
• No DIDs• Security through
registration (like phones)• Holes in your firewall• STUN keep-alive traffic
5Pingtel ConfidentialMay 3, 2005
Deployment Example
Ingate SIParatorsipX Media &Config Server
sipX HA Call Control Server
Load Balance &Fail Over
• 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
• 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
6Pingtel ConfidentialMay 3, 2005
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
7Pingtel ConfidentialMay 3, 2005
What About Voice Quality?
• Depends on the quality of your data connection
• Fewer format conversions improves quality
• Polycom’s HD Voice supported for on-net calls only
• Requires proper network engineering: VLAN, QoS, TOS
• Usually results in higher voice quality
8Pingtel ConfidentialMay 3, 2005
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
9Pingtel ConfidentialMay 3, 2005
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
SIP TrunkingSeminar
Can Your PBX do That?October 2006
11Pingtel ConfidentialMay 3, 2005
Today’s 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.
- Pingtel’s Scott Lawrence is leading our involvement in this group - Scott is Pingtel’s 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 world’s 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?
option=com_content&task=view&id=17&Itemid=47
- 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
12Pingtel ConfidentialMay 3, 2005
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
- AT&T, MCI, Time Warner, XO, T Systems
Customer-supplied media gateway
SIPxchange PBX
IPIP
SIP trunk
Max.1,500 seats / server30 media ports
TDM Voice trunk
13Pingtel ConfidentialMay 3, 2005
2 Major SIP Trunk Types (cont’d)
• 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 provider’s proxy using single user credentials
- Known offerings currently available and in production
- Vonage, Broadvoice, AT&T CallVantage
- Usually used by Asterisk users
Customer-supplied Digium gateway
Asterisk(B2BUA)
IPIP
User Agent registration
Max.100 seats / serverBec. of B2BUA
TDM Voice trunk
14Pingtel ConfidentialMay 3, 2005
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)
15Pingtel ConfidentialMay 3, 2005
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
16Pingtel ConfidentialMay 3, 2005
Contacts
• Level 3
- Doug Widdoes, Northeast Sales Director, [email protected] , (330) 528-3001
• BBCOM
- Anthony Santana, Account Manager, [email protected]
• NextGenData
- Terry Carpenter, [email protected] , (484) 334-4122
• City Voice
- Kelly Lowther, VP, [email protected] , (603) 659-2912 x104
• Pingtel
- Scott Lawrence, Consulting Engineer, [email protected]
- Neil Segall, VP Sales, [email protected], 781-439-5640
- Bob Pizani, Manager, Systems Engineering, [email protected]