troubles with rfcomm_sppd

The same problem with rfcomm_sppd onto 6-current (23 Jan kernel&world) and
5-stable (4 Jan kernel)

I used to use rfcomm_sppd with my BT-capable mobile phone to get access 
to internet via gprs. I used to run it like this (and it worked several
months ago):

rfcomm_sppd -a 00:01:e3:3f:d1:9a -b -t /dev/ttyp4

It was ok but now it is not, as I get such a message:

Jan 25 02:38:22 laptoxa rfcomm_sppd: Could not open(/dev/ptyp4).
Input/output error

When trying to change device to ptyp4 like this:

rfcomm_sppd -a 00:01:e3:3f:d1:9a -b -t /dev/ptyp4

I'm getting another message:

Jan 25 02:39:09 laptoxa rfcomm_sppd: Master and slave tty are the same
(/dev/ptyp4)


I confused with "Could not open(/dev/ptyp4)" in the first example due ti
the fact I run rfcomm_sppd with "-t /dev/ttyp4"

Any ideas?
Thanks in advance.