Ethereal-dev: Re: [Ethereal-dev] [PATCH] T.38 over TPKT over TCP

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From: "Ronnie Sahlberg" <ronnie_sahlberg@xxxxxxxxxxxxxx>
Date: Tue, 27 Jan 2004 22:16:37 +1100
From: "Martin Regner"
Subject: Re: [Ethereal-dev] [PATCH] T.38 over TPKT over TCP


> > For T.38-over-TCP, is there a convenient way to find the length of a
> > PER sequence, using a bounded number of bytes from the beginning of the
> > packet, and not using more bytes than the minimum length of a PER
> > sequence?
>
> No, there is no convenient way to find the length when the packet is PER
> encoded.

Speaking for those that has in the past had to read and parse the hexdump of
PER encoded
PDUs:    Very few things, if any, are convenient when it comes to PDU.  :-)

While being a very compact encoding, convenience in parsing the data is not
one of the
features of asn.1/per.

(thank god h323 at least use aligner-per and not unaligned per)