Remote offices survival

Survivability Challenges
VoIP Solutions that are MORE THAN JUST TALK 19 November 2011

Remote Office Survivability
Agenda

• Understanding the Challenge
• Scenarios
• Solutions approaches
• End point dual registration in detail
• Quick guide
• A proposal to Elastix Community

2

Survivability
The Challenge

Problem Definition.

Many organizations deploying IP Telephony solutions are using a similar, very cost
effective model where a central telephony server supports many IP/Ethernet-based
phones in remote sites.

Recognizing the need for reliability, these companies are making their central IP-
PBXs highly redundant, often deploying multiple servers for failover.

However, what happens if there's an issue on the WAN? Perhaps a circuit fails, or a
routing loop occurs.

………… No matter how redundant your telephony server is, if your IP phones can't
reach it, they lose dial-tone………………

3

Survivability
The Challenge

• Telephony is one of those facts of live that we take for granted (as
the fact that we breadth without any conscientious control from
ourselves)
• You take for granted that a dial tone will come up just picking up a
handset, and you will be able to communicate to somebody else just
after a few key strokes.
• Have you ever thought in what is the difference in impact for any
organization when you have a few minutes service interruption on
Internet access, or Accounting System Access compared with being
a few minutes without phone service?.

…………………A “Survival Enabled” VoIP deployment is
the one that has included a series of attributes and
characteristics on all of the components, in the
underlying infrastructure as well as all the distributed
components……….

4

Survivability
The Challenge

There is no such thing as a Survival Gateway, or a Survival Phone or even a
Survival PBX….

…… there are a series of attributes for all of them to be able to have a
Survivable designed solution…

Lets then Define:

• Online Mode. From the perspective of any SIP device, On Line Mode is when
this device has full interaction and connectivity with the central point of
arbitrage (IP PBX, UC Server, etc).

• Survival Mode. From the same perspective, is when the device loose the
“advice/guidance” from the central site and now needs to take decisions by
itself on how to process a request.

5

Survivability
Scenarios of resolution
PSTN

3 known and common PRIMARY
REG. SVR

approaches: SECONDARY
REG. SVR

SIPx Server
Farm

- Learning Outbound Proxy WAN

- B2BUA
- Dual Registration

6

Survivability
Scenarios of Resolution

• Learning Outbound Proxy:
PST PRIM
N ARY
REG.
SVR

SECOND

- A local device in the Remote Location
ARY
REG. SVR

SIPx
Server
Farm

acts as the Outbound Proxy.
WA
N

- It learns:
• Who is registered and authenticated
where.
• How calls are routed and treated

- You add:
• Default Outbound routes for survival calls
• How incoming calls are treated in survival
mode

7

Survivability

• Back to Back User Agent
PST PRIM
N ARY
REG.
SVR

SECONDA

- A local entity provides all registration
RY
REG. SVR

SIPx
Server
Farm

and authentication features for local
WA
N

sip devices.
- The local entity registers and
replicates authentication requests to
the central site on behalf of each local
device
- Local Entity has rules to treat calls
when outbound registration is not
working
8

Survivability

• Dual or Redundant registrar.
PST
PRIM
N ARY
REG.
SVR

- Each local device has 2 or more registrar SECOND
ARY
REG. SVR

SIPx
Server

destinations for the same UA.
Farm

WA
N

- Each local Device is able to switch to a
secondary registrar/proxy when primary
is not responding.
- Each local device is able to identify when
primary registrar is back to normal
- One of the local SIP devices is able to
provide the secondary server capabilities
with basic telephony features

9

Survivability
Dual registrar in details

PSTN PRIMARY
REG. SVR

SECONDARY
REG. SVR
SIPx Server
Farm

WAN

10

Survivability

SECONDARY
REG. SVR (1) PSTN PRIMARY
REG. SVR

VRRP or similar
Redundant Router
SECONDARY
REG. SVR (2)

SIPx Server
WAN Farm

11

Survivability

PRIMARY REGISTRATION SERVER

REPORTED REGISTERED REPORTED NON-REGISTERED
SERVICE AVAILABLE

PENDING FOR FIRST SIP
REQUEST AFTER SYSTEM
NORMAL ONLINE STATUS
CAME BACK, OR NEXT RETRY
(STAGE 1.1)
REGISTRATION
(STAGE 1.4)
SERVICE NON-AVAILABLE

TRANSITION AFTER MAIN
SITE DOWN AND BEFORE
NORMAL SURVIVAL MODE
NEXT REGISTRATION OF SIP
(STAGE 1.3)
DEVICE
(STAGE 1.2)

12

Survivability
Dual Registrar – Reduce unstable stages

Stage 1.2.
Reduce expiration time for registration to a minimum value in the
SIP end device.
Having the phone (SIP end Device) to force an un-registered state
if an invite times out.
Use TCP for SIP signaling instead of UDP. That will eliminate the
timeouts waiting times.
Stage 1.4 .
Keep the Registration retry time very short
In any INVITE the SIP end device, always try the primary even if it
is declared as non-registered, and if succeed, re-register. This is
the typical way most of the Phone Vendor implement dual
registration (Already tested with Polycom)

13

Survivability
A Quick Guide for Dual Registrar Approach

• Suggested Devices attributes:
- Local SIP devices with Dual
Registrar/Proxy support.
- Extended functionality on local
Gateway(s):
• Be the Local Call Control for
• WAN Access Router
• VRRP
• Registrar Server
• Local PSTN connection

14

Survivability
A Proposal to Elastix Community

• Go beyond Hardware Certification Program
- AutoDiscovery
- AutoProvisioning
• Consider Survivability as a solution
attribute design.
- Add a remote Location entity
- Associate SIP End devices belonging to remotes
- Define Survival Mode rules
- Push Survival Attributes to the local Call Control
Device (Gateway/Router)

15

SmartNode VoIP Gateway
Question and Answers

16

PRODUCT PRESENTATION
19 November 2011

Corporate Overview

Over 1,000 products…
• Patton Designed
• Patton Manufactured
• Patton Supported
• Patton Certified

18

Corporate Overview

Patton
Engineered

A Family Made in
Company the USA

Global
Unrivaled
Range,
Customer
Local
Support
Reach

19

Corporate Overview

Global Range, Local Reach
• Washington DC, USA – Patton Electronics
- Headquarters
- Manufacturing plant
• Berne, Switzerland – Patton-Inalp Networks
- VoIP competency center
- Sales & Marketing Western Europe
• Chennai, India – Patton India
- Sales & Marketing India
- R&D Center
• Additional offices
- Italy, Hungary, Vietnam, Lebanon, Mexico and Sydney

20

Applications

In the meantime…. Future:
All IP

SmartNode
Point of Service between TDM and IP
Past:
› TDM: Circuit-switched, using ISDN or analog lines
All TDM › IP: Packet-based, using Internet Telephony technology

21

Applications

SmartNode Jobs
 Call Switching
Voice Circuit Switch

 Protocols conversion
PSTN
 Voice encoding and decoding

SmartNode

Gateway
 IP Routing

VoIP
VoIP

Data/Voice IP Router

22

Applications: IP PBX

IP PBX
PSTN /
PBX

LAN / VoIP
ISDN Phones WAN /
VoIP

FAX
IP Phones

Terminal Gateway SIP Trunk Gateway

23


• Terminal Gateway
- Connects any analog device to the LAN
• Phone, fax, modem, door or elevator communication
system, etc.

IP PBX

LAN / VoIP
ISDN Phones

FAX IP Phones

24


• SIP Trunk Gateway to PSTN
- Connects IP telephony to PSTN
- Survivability
• Life Line (in case of power failure)
• SIP Registrar (in case of server failure)

IP PBX
PSTN

LAN / VoIP
Life Line
IP Phones ISDN Phone

25


• SIP Trunk Gateway to VoIP/PSTN
- Enterprise Session Border Router
• VoIP to VoIP connection, including transcoding

- PSTN Fallback if network goes down
- QoS for voice priority

IP PBX PSTN Fallback
PSTN

LAN / VoIP

WAN /
VoIP

IP Phones
26

Applications: SIP Trunking

• SIP Trunking with Traditional PBX
- Cut costs with VoIP
- Preserve investments in existing infrastructure
- PSTN Fallback

PSTN Fallback
ISDN Phones PSTN
PBX
ITSP

T1 WAN / VoIP

FXS SIP
27


• SIP Trunking with all IP
- QoS
- Security
- Transcoding

IP PBX ITSP

WAN / VoIP

IP Phones
FAX
28


• SIP Trunking with IP AND traditional telephony
- Smooth migration from old to new
- Staged investments

PBX
ITSP

WAN / VoIP

IP PBX
29

IP PBX Partners

30

Softswitch Partners

31

VoIP Provider Partners

32

Why SmartNode?

• More than just talk
- Patton Quality & Reliability
- Proven Interoperability
- Robust Enterprise Feature Sets and Functionality
- Industry-Best Customer Support
- Swiss Designed. Made in the USA.

33

Port Layout

Power WAN Uplink

Telephony:
ISDN BRI (S0), PRI, LAN/WAN
FXS, FXO Ethernet

34

SmartWare Software

• Same firmware for all models
- Easy to manage
- High interoperability
- Learn one, know them all

• Release cycle
- Free upgrades every two months
- Free updates every 18-months

• Swiss precision engineered

35

SmartNode Software Features

Full VoIP Protocol Support
 SIPv2
 T.38 Fax, Fax and Modem Bypass,
 G.711, G.729, G.726, G.727, G.723
 DTMF relay, transparent ISDN data

Telephony Features Quality of Service
 Euro-ISDN-DSS1, NTT and Q.SIG  Voice Priority
 AOC  Traffic Management
 CLIP/CLIR  DownStreamQoS™
 Hold, Transfer and much more  TOS, DiffServ, 802.1p

Management & Provisioning Complete Access Routing
 Web and CLI managed  IP Router, RIP
 Auto-Provisioning  Firewall - NAPT, ACL
 Configuration Up- and Download  DHCP, PPPoE
 Remote upgrades, SNMP  IPSec VPN

Outstanding Interoperability
 Advanced Call Routing
 Regular Expression Routing
 Numbering Plan Integration
 Interoperable for Voice and T.38 fax

36

Survivability

• Voice and Data Survivability
- PSTN Fallback
- Failover Relay
- SIP Registrar
- Dial Backup
- IP-Link Redundancy

37

Survivability

- PSTN Fallback
• SmartNode automatically reroutes to the
PSTN in the case of a network outage.
- Failover Relay
- SIP Registrar
- Dial Backup

38

Survivability

- PSTN Fallback
- Failover Relay
• SmartNode automatically reroutes to the PSTN in the case
of a power outage.
- SIP Registrar
- Dial Backup

39

Survivability

- PSTN Fallback
- Failover Relay
- SIP Registrar
• SIP clients can register directly with the SmartNode instead
of a SIP softswitch. This enables the registered SIP clients
to be able to make and receive calls over the PSTN during a
network outage.
- Dial Backup

40

Survivability

- PSTN Fallback
- Failover Relay
- SIP Registrar
- Dial Backup
• During network and power outages, SmartNode enables
dial-up connection to the PSTN for data transfers.

41

Survivability

- PSTN Fallback
- Failover Relay
- SIP Registrar
- Dial Backup
• Many SmartNode models ensure connectivity to the
network by offering multiple Ethernet ports for WAN link
redundancy.

42

QoS

• Ensures voice quality by managing data
communications so that voice packets and
other real-time data are prioritized.
- Priority
- Weighted Fair Queuing (WFQ)
- Shaping
- Burst-Tolerant Shaping

43

QoS

• DownStreamQoS™
- When data floods your downstream line because of
large file downloads, SmartNode creates a virtual
bottleneck for data traffic to ensure time-sensitive
voice traffic gets through properly.

44

Fax that Works

• The Problem
- VoIP technologies were designed for voice
communications, not fax. Fax requires an
uninterrupted data flow to operate.
• SmartNode Solution
- G.711 bypass
- T.38 Faxing
- Fax Transcoding
- Interoperability
- High-Precision Clock

45

SmartNode Product Categories

Gateway-
Gateway IAD ESBR
Router
VoIP Gateway: SN4960 Only
Converts PSTN to SIP(or H.323) Yes Yes Yes
PSTN Interfaces: FXS, FXO, BRI, PRI

IP Router No Yes Yes Yes
IP Routing, QoS, VPN, etc.

WAN Access: No No Yes Optional
G.SHDSL, ADSL, X.21, V.35

VoIP Border Controller:
No No No Yes
Interconnects multiple VoIP networks

Ethernet Ports 1 2+ 1+ 2+

46

SmartNode Product Categories

Gateway Gateway-Router IAD
PBX/Phones PBX/Phones PBX/Phones

Modem
LAN LAN

Modem WAN WAN
LAN

WAN

47

Analog FXS/FXO Product Line

M-ATA SN4110 SN4520 SN4830 SN4300 SN4400* SN4900

Telephony Interfaces FXS FXS & FXO FXS & FXO FXS & FXO FXS FXS FXS or FXO

2, 4, 6, or 2, 4, 6, or 2, 4, 6, or 16, 24, or 12, 16, 24, 12, 16, 24,
# of Telephony Ports 1
8 8 8 32 or 32 or 32

VoIP Gateway:
Converts PSTN to SIP(or
H.323) Yes Yes Yes Yes Yes Yes Yes
PSTN Interfaces: FXS, FXO,
BRI, PRI

IP Router No No Yes Yes No Yes Yes

Number of Ethernet
1 1 2 2 1 2 2
Ports
G.SHDSL (Optional)
No
WAN Access No No No Serial X.21 No Serial X.21
Serial V.35 Serial V.35

*The SN4400 only differs from the SN4900 in that it has FXS interfaces only, no WAN access, a single internal power supply, and 0
to 40 C operating temperature (instead of 0 to 50 C)

48

ISDN BRI Product Line

SN-DTA SN4120 SN4630 SN4650 SN4660 SN4670

BRI with BRI with
Telephony Interfaces BRI (NT or NT+TE) BRI (TE) BRI BRI
FXS/FXO FXS/FXO

# of Telephony Ports 1 or 2 1 or 2 3 or 5 3 or 5 Up to 12 Up to 12

# of VoIP Calls 2 or 4 2 or 4 4 or 8 4 or 8 Up to 36 Up to 36

VoIP Gateway:
Converts PSTN to SIP(or H.323) Yes Yes Yes Yes Yes Yes

IP Router No No Yes Yes Yes Yes

Number of Ethernet Ports 1 1 2 1 4 4

G.SHDSL
WAN Access No No No Serial X.21 No G.SHDSL
Serial V.35

49

T1/E1/PRI Product Line

SN4940 SN4950 SN4960

Telephony Interfaces T1/E1/PRI T1/E1/PRI T1/E1/PRI

# of Telephony Ports 1 or 4 1 or 4 1 or 4

# of VoIP Calls Up to 120 Up to 120 Up to 120

VoIP Gateway:
Converts PSTN to SIP(or H.323) Yes Yes Yes

IP Router No Yes Yes

Number of Ethernet Ports 1 2 2

G.SHDSL
(Optional)
WAN Access No Serial X.21
G.SHDSL
Serial V.35

VoIP Border Controller: No No Yes
Interconnect multiple VoIP networks

50

Enterprise Session Border Routers (ESBR) Product Line

SN5200 SN5400 SN4960

T1/E1/PRI
Telephony Interfaces None None
(1 or 4)

SIP to SIP Call Capacity Up to 32 Up to 196 Up to 180

SIP to SIP Call Capacity With Transcoding N/A Up to 64 Up to 60

VoIP Gateway:
Converts PSTN to SIP(or H.323) No No Yes

IP Router Yes Yes Yes

Number of Ethernet Ports 5 2 2

G.SHDSL
WAN Access No G.SHDSL Serial X.21
Serial V.35

VoIP Border Controller: Yes Yes Yes
Interconnect multiple VoIP networks

51

Industry-Best Customer Support

• The BEST support team in the business!
- Free Lifetime Support and Upgrades
- 24/7 Premium Support
- SmartNode Training
- On-Line Help

“Your support team was fantastic. The best
support call I have ever had to make. You
guys are by far the best (and I have called
everyone) in the business. I can't thank you
enough for the great service.”
- Joe Santaniello- IT Manager at Wireless Zone

52


For more information on
SmartNode, please visit:
www.patton.com/smartnode

53

Question and Answers

e: sales@patton-inalp.com
t: +41 (31) 985 25 25
f: +41 (31) 985 25 26

54

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