Remote offices survival

April 10, 2023VoIP Solutions that are MORE THAN JUST TALK

Survivability Challenges

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

Remote Office SurvivabilityAgenda

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The Challenge

Survivability

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………………

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• 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……….

The Challenge

Survivability

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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.

The Challenge

Survivability

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3 known and common approaches:

- Learning Outbound Proxy- B2BUA- Dual Registration

Scenarios of resolution

Survivability

WANWAN

PSTNPSTN

SIPx Server Farm

SECONDARYREG. SVR

PRIMARY REG. SVR

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WAN

WAN

PSTN

PSTN

SIPx Server Farm

SECONDARY

REG. SVR

PRIMARY REG. SVR•Learning Outbound Proxy:

- A local device in the Remote Location acts as the Outbound Proxy.

- 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

Scenarios of Resolution

Survivability

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WANWAN

PSTN

PSTN

SIPx Server Farm

SECONDARY

REG. SVR

PRIMARY

REG. SVR•Back to Back User Agent

- A local entity provides all registration and authentication features for local 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


Survivability

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•Dual or Redundant registrar.- Each local device has 2 or more registrar

destinations for the same UA.- 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


Survivability

WAN

WAN

PSTN

PSTN

SIPx Server Farm

SECONDARY

REG. SVR

PRIMARY REG. SVR

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Dual registrar in details

Survivability

WANWAN

PSTNPSTN

SIPx Server Farm

SECONDARYREG. SVR

PRIMARY REG. SVR

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Survivability

WANWANSIPx Server

Farm

PSTNPSTNSECONDARYREG. SVR (1)

PRIMARY REG. SVR

SECONDARYREG. SVR (2)

VRRP or similar Redundant Router

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Survivability

REPORTED REGISTERED REPORTED NON-REGISTERED

SER

VIC

E A

VA

ILA

BLE

NORMAL ONLINE STATUS (STAGE 1.1)

PENDING FOR FIRST SIP REQUEST AFTER SYSTEM

CAME BACK, OR NEXT RETRY REGISTRATION

(STAGE 1.4)

SER

VIC

E N

ON

-AV

AIL

AB

LE

TRANSITION AFTER MAIN SITE DOWN AND BEFORE

NEXT REGISTRATION OF SIP DEVICE

(STAGE 1.2)

NORMAL SURVIVAL MODE (STAGE 1.3)

PRIMARY REGISTRATION SERVER

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Dual Registrar – Reduce unstable stages

Survivability

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 shortIn 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)

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•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

A Quick Guide for Dual Registrar Approach

Survivability

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•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)

A Proposal to Elastix Community

Survivability

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Question and Answers

SmartNode VoIP Gateway

April 10, 2023

PRODUCT PRESENTATION

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Corporate Overview


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

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Corporate Overview


Patton Engineered

Made in the USA

Unrivaled Customer Support

Global Range, Local Reach

A Family Company

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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

Corporate Overview


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Past: All TDM

Future: All IP

In the meantime….

SmartNodePoint of Service between TDM and IP

› TDM: Circuit-switched, using ISDN or analog lines› IP: Packet-based, using Internet Telephony technology

Applications

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SmartNode Jobs

Call Switching

Protocols conversion

Voice encoding and decoding

IP Routing

Smar

tNod

e

Circuit Switch

VoIP

G

atew

ay

IP RouterData/Voice

Voice


Applications

VoIP

PSTN

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Terminal Gateway SIP Trunk Gateway


WAN / VoIP

PSTN / PBX

LAN / VoIP

IP PBX

IP Phones

ISDN Phones

FAX

Applications: IP PBX

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•Terminal Gateway- Connects any analog device to the LAN

• Phone, fax, modem, door or elevator communication system, etc.



LAN / VoIP

IP PBX

ISDN Phones

FAX IP Phones

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•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)



PSTN

LAN / VoIP

ISDN Phone

Life LineFallback

Registrar

IP PBX

IP Phones

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•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



WAN / VoIP

PSTN

LAN / VoIP

PSTN FallbackIP PBX

IP Phones

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

Applications: SIP Trunking


ITSP

SIPT1

FXSWAN / VoIP

ISDN Phones

PBX

PSTNPSTN Fallback

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



IP PBX ITSP

WAN / VoIP

IP PhonesFAX

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



WAN / VoIP

PBX

IP PBX

ITSP

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IP PBX Partners


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Softswitch Partners


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VoIP Provider Partners


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• 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.

Why SmartNode?


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WAN Uplink

Telephony:ISDN BRI (S0), PRI, FXS, FXO

LAN/WAN Ethernet

Port Layout


Power

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• 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

SmartWare Software


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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 Euro-ISDN-DSS1, NTT and Q.SIG AOC CLIP/CLIR Hold, Transfer and much more

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

Complete Access Routing IP Router, RIP Firewall - NAPT, ACL DHCP, PPPoE IPSec VPN

Quality of Service Voice Priority Traffic Management DownStreamQoS™ TOS, DiffServ, 802.1p

Management & Provisioning Web and CLI managed Auto-Provisioning Configuration Up- and Download Remote upgrades, SNMP

SmartNode Software Features


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

Survivability


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•Voice and Data Survivability- PSTN Fallback

• SmartNode automatically reroutes to the PSTN in the case of a network outage.

- Failover Relay- SIP Registrar- Dial Backup- IP-Link Redundancy

Survivability


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•Voice and Data Survivability- PSTN Fallback- Failover Relay

• SmartNode automatically reroutes to the PSTN in the case of a power outage.

- SIP Registrar- Dial Backup- IP-Link Redundancy

Survivability


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•Voice and Data 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- IP-Link Redundancy

Survivability


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•Voice and Data 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.

- IP-Link Redundancy

Survivability


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

• Many SmartNode models ensure connectivity to the network by offering multiple Ethernet ports for WAN link redundancy.

Survivability


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•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

QoS


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•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.

QoS


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•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

Fax that Works


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Gateway

Gateway-Router IAD ESBR

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

Yes Yes YesSN4960 Only

IP RouterIP Routing, QoS, VPN, etc.

No Yes Yes Yes

WAN Access:G.SHDSL, ADSL, X.21, V.35

No No Yes Optional

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

Ethernet Ports 1 2+ 1+ 2+

SmartNode Product Categories


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SmartNode Product Categories


Gateway Gateway-Router IAD

WAN

LAN

LAN

PBX/Phones

WAN

Modem

Modem

LAN

PBX/Phones

WAN

PBX/Phones

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M-ATA SN4110

SN4520

SN4830

SN4300

SN4400*

SN4900

Telephony Interfaces

FXSFXS & FXO

FXS & FXO

FXS & FXO

FXS FXSFXS or FXO

# of Telephony Ports

12, 4, 6, or

82, 4, 6, or

82, 4, 6, or

816, 24, or

3212, 16, 24,

or 3212, 16, 24,

or 32


Yes Yes Yes Yes Yes Yes Yes


No No Yes Yes No Yes Yes

Number of Ethernet Ports

1 1 2 2 1 2 2

WAN Access No No No

G.SHDSLSerial X.21Serial V.35

NoNo

(Optional)Serial X.21Serial 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)

Analog FXS/FXO Product Line


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SN-DTA

SN4120

SN4630

SN4650

SN4660

SN4670

Telephony Interfaces BRI (NT or NT+TE)

BRI (TE) BRI BRIBRI with FXS/FXO

BRI with 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


Yes Yes Yes Yes Yes Yes


No No Yes Yes Yes Yes

Number of Ethernet Ports

1 1 2 1 4 4

WAN Access No No NoG.SHDSL

Serial X.21Serial V.35

No G.SHDSL

ISDN BRI Product Line


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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


Yes Yes Yes


No Yes Yes

Number of Ethernet Ports 1 2 2

WAN Access No(Optional)G.SHDSL

G.SHDSLSerial X.21Serial V.35

VoIP Border Controller:Interconnect multiple VoIP networks

No No Yes

T1/E1/PRI Product Line


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SN5200 SN5400 SN4960

Telephony Interfaces None NoneT1/E1/PRI(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


No No Yes


Yes Yes Yes

Number of Ethernet Ports 5 2 2

WAN Access No G.SHDSLG.SHDSL

Serial X.21Serial V.35

VoIP Border Controller:Interconnect multiple VoIP networks

Yes Yes Yes

Enterprise Session Border Routers (ESBR) Product Line


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

Industry-Best Customer Support


“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

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For more information on

SmartNode, please visit:

www.patton.com/smartnode

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Question and Answers

e: [email protected]: +41 (31) 985 25 25f: +41 (31) 985 25 26


Date post:	23-Jan-2015
Category:	Technology
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Remote offices survival

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