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Solution for Keeping Fixed Network Access Connection Alive with Less Load Generation

IP.com Disclosure Number: IPCOM000171883D
Published in the IP.com Journal: Volume 8 Issue 7A (2008-07-10)
Included in the Prior Art Database: 2008-Jul-10
Document File: 1 page(s) / 34K

Publishing Venue

Siemens

Related People

Juergen Carstens: CONTACT

Abstract

If a SIP (Session Initiation Protocol) UE (User Equipment) runs on the equipment in the network using NAT (Network Address Translation), some mechanism has to be used to ensure that ports on the NAT box stays open for incoming traffic. The only possibility to keep ports open is to send packets frequently (at least once per 30 seconds). The packets must be sent by the client behind the NAT. Received packets are not taken into account. The current solution is based on misuse of the SIP re-registration. In SIP, the server may set very low interval in which the user equipment must re-register to the network. REGISTER requests then keeps the ports open. To fulfil the goal, witch means to keep the ports open, sending empty packets from UE is enough. The proposed solution makes use of the extensibility of the SIP protocol. There are the following options to signal the compatibility with this requirement: (a) The option tag like "KeepingOpenPort" is present in the "Supported" header field of the REGISTER request sent by UE. (b) The header field like p.com.siemens.sbc: KeepingOpenPort is present in the header field of the REGISTER request.

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Solution for Keeping Fixed Network Access Connection Alive with Less Load Generation

Idea: Zdenek Bruzl, CZ-Brno

If a SIP (Session Initiation Protocol) UE (User Equipment) runs on the equipment in the network using

NAT (Network Address Translation), some mechanism has to be used to ensure that ports on the NAT

box stays open for incoming traffic. The only possibility to keep ports open is to send packets

frequently (at least once per 30 seconds). The packets must be sent by the client behind the NAT.

Received packets are not taken into account.

The current solution is based on misuse of the SIP re-registration. In SIP, the server may set very low

interval in which the user equipment must re-register to the network. REGISTER requests then keeps

the ports open.

To fulfil the goal, witch means to keep the ports open, sending empty packets from UE is enough. The

proposed solution makes use of the extensibility of the SIP protocol. There are the following options to

signal the compatibility with this requirement:
(a) The option tag like "KeepingOpenPort" is present in the "Supported" header field of the

REGISTER request sent by UE.
(b) The header field like p.com.siemens.sbc: KeepingOpenPort is present in the header field of

the REGISTER request.

Option (a) would require standardization in the form of RFC (Requests for Comments) and registration

by IANA (Inte...