messaging services since 1992

Retarus is a global provider of highly professional

Messaging Services, Retarus develops market-leading

products and solutions for global electronic business

communications and business process optimization.

Managed Fax Services for the Enterprise

T.38 Protocol

What is it and how it works

messaging services since 1992

• Faxes were initially designed to be

transmitted over a TDM or POTS (plain old

telephone line) network

• Trying to send a fax over an IP network can

cause packet loss, delay and jitter. Not an

ideal situation

• Enter the T.38 protocol

• T.38 is a protocol developed in 1998 to

allow the transmission of Faxes over an IP

(Internet Protocol) network

T.38

What is it?

messaging services since 1992

• For most people T.38 will not impact a fax in

any way other than it lets you send a fax

over the IP network no matter what the

receiving device is:

• a fax machine

• fax board

• IP fax service

T.38

How will T.38 effect my faxes?

messaging services since 1992

T.38 Fax Relay Protocol

Fax

Server

PC

Fax

PSTN PSTN

Gateway Gateway

T.38

Illustration of T.38

messaging services since 1992

• The T.38 protocol is a critical component for

utilizing IP gateways instead of traditional

phone systems. Trying to use an IP network

without T.38 will dramatically increase call

disconnects

• Having high availability on your fax gateway

is still critical for your fax arriving at your

destination correctly rendered and with no

transmission errors

T.38

What is it?

messaging services since 1992

• T.38 is an important protocol, however

Reliability and throughput are the most

critical components for delivering a fax

• Choose a service provider who is more

concerned with deliverability statistics than

Least Cost Routing

• When a service provider implements Best

Deliverability Routing (BDR) instead of LCR,

you have a much more efficient solution and

a higher success rate for your faxes

Want to know more? Contact retarus at info@retarus.com or on the

web at www.retarus.com

T.38

So Does T.38 matter to Me?

messaging services since 1992

Our values

The core of our business

People drive business. From

experienced Sales and Support

teams to project-driven

customization of services - our

clients remain the focus of our

daily work. You benefit from a

true Partnership.

Customer focus

As experts we know what a

difference consistent quality

makes. We focus on how our

service drives your business. We

set the global standard for

messaging services. You benefit

from increased Efficiency.

Quality

Providing services also means

providing proof of service - from

intelligent reporting to coherent

billing, from service provision to

documentation. From Reports,

portals ,SAP status updates, you

benefit from absolute Control.

Transparency

Developing leading-edge

technology and expanding our

portfolio means listening closely,

understanding trends and

serving our customers’ needs

and strategies. You benefit from

new Technologies.

Innovation