> I would like to know if ethereal can analyse or decode the BER encoded
> files.
Ethereal can decode certain protocols that use the ASN.1 Basic Encoding
Rules, e.g. SNMP, LDAP, and Kerberos. It does not, however, dissect
*all* protocols that use that format.
> Pls tell me if there are any freeware or opensource softwares to
> decode and encode BER files of TAP3 format.
I don't know if any exist, but, as Ethereal *does* include code that can
be used, by dissectors for BER-encoded protocols, to extract BER-encoded
data from packets, somebody who had
1) a specification for the protocol you want to dissect
and
2) time to write a dissector for it
(I have neither the first nor the second, at present) could conceivably
write a dissector for the protocol.
> I would also like to know if ethereal can anlysis the MTP and MAP
> packets of the ss7 layers?
There's a dissector for the "Message Transfer Part Level 3", which are
called by the "MTP2 Peer Adaptation Layer" and "MTP3 User Adaptation
Layer" dissectors; those dissectors, in turn, register with the SCTP
dissector, so the MTP3 dissector will be used for phone calls made over
IP-based networks using SCTP.
I assume that's the MTP to which you're referring; I'm not a telephony
expert.
> I tried to convert one of my ss7 raw packet
> file to pcap by text2pcap but i was unsuccessful.
If this is raw SS7, rather than SS7 protocols running, ultimately, atop
TCP/IP, text2pcap won't help you; libpcap format was designed for
computer networking use, and has no provision for files of raw SS7
traffic that's not running over a computer network such as Ethernet,
FDDI, etc..
