A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : New SIP Headers for Reducing SIP Message Size
Author(s) : H. Akhtar, et al.
Filename : draft-akhtar-sipping-header-reduction-00.txt
Pages : 18
Date : 2006-2-28
Current SIP messages are text based and inherently large, especially
when these messages are to be transmitted over the bandwidth-strained
wireless access technologies (a typical orginiating SIP Invite is
about 1200 bytes).
For most wireless technologies, transmitting the session initiation
messages (such as SIP Invite) over the signaling channel can reduce
the call setup time substantially. The size limitation of these
wireless signaling channels are typically very small (~210 bytes in
the uplink and ~110 bytes in the downlink).
To address this problem, a new function called Encoding Assitant
(EA) has been introduced in the User Agent (UA) and in the
SIP Proxy server within the network. Additionally, the method
provided in this document defines new SIP option tags and headers.
These new option tags and headers allow the UA and a SIP Proxy
server within the network (such as the P-CSCF), to exchange
information using the signaling channels supported by most wireless
access networks.
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