<s>
Bearer	B-Protocol
Capability	I-Protocol
in	O
telecommunications	O
is	O
one	O
of	O
the	O
Information	O
Elements	O
(	O
fields	O
)	O
of	O
the	O
Q.931	O
SETUP	O
message	O
.	O
</s>
<s>
It	O
is	O
used	O
by	O
the	O
calling	O
party	O
to	O
specify	O
the	O
kind	O
of	O
B	B-Protocol
channel	I-Protocol
that	O
is	O
being	O
requested	O
.	O
</s>
<s>
For	O
example	O
,	O
if	O
a	O
Bearer	B-Protocol
Capability	I-Protocol
of	O
Speech	O
is	O
specified	O
,	O
then	O
the	O
network	O
is	O
free	O
to	O
select	O
a	O
set	O
of	O
facilities	O
that	O
are	O
able	O
to	O
provide	O
this	O
service	O
(	O
including	O
,	O
in	O
this	O
case	O
,	O
analogue	O
trunks	O
and	O
routes	O
involving	O
echo	O
cancellers	O
or	O
DCME	B-Protocol
)	O
.	O
</s>
<s>
If	O
,	O
on	O
the	O
other	O
hand	O
,	O
a	O
Bearer	B-Protocol
Capability	I-Protocol
of	O
Unrestricted	O
Digital	O
Information	O
is	O
specified	O
,	O
then	O
the	O
network	O
is	O
required	O
to	O
set	O
up	O
the	O
call	O
using	O
only	O
end-to-end	O
digital	O
facilities	O
(	O
without	O
the	O
use	O
of	O
robbed-bit	O
signalling	O
,	O
echo	O
cancellers	O
,	O
DCME	B-Protocol
nor	O
A-law	B-Algorithm
to	O
mu-law	B-Algorithm
conversion	O
)	O
,	O
or	O
reject	O
the	O
call	O
if	O
no	O
end-to-end	O
digital	O
circuit	O
is	O
available	O
.	O
</s>
<s>
The	O
Bearer	B-Protocol
Capability	I-Protocol
is	O
augmented	O
by	O
the	O
Higher	O
Layer	O
Compatibility	O
(	O
HLC	O
)	O
Information	O
Elemen	O
(	O
another	O
field	O
in	O
the	O
Q.931	O
SETUP	O
message	O
)	O
,	O
which	O
informs	O
the	O
network	O
of	O
the	O
use	O
that	O
the	O
caller	O
intends	O
to	O
make	O
of	O
the	O
channel	O
.	O
</s>
