Toshiba CTX28 manual Capture Packets, Protocol Name Type Use, Purpose

IP Telephony and QSIG Over IP

CTX IP Troubleshooting

Capture Packets

Packet types to be captured are:

Protocol Name	Type	Use, Purpose
RAS (H.225)	udp	for searching BIPU and registering IPT with the system
MEGACO+	tcp	call control protocol
RTP	udp	carry the voice data
		control RTP
RTCP	udp	System uses this protocol to measure the round-trip delay of rtp packets
		between BIPU and IPT (currently unavailable).
SNMP	udp	get/set CTX data from CTX WinAdmin
FTP	tcp	to download updating file when updating the BIPU/IPT program.
FTP-data	tcp	to download updating file when updating the BIPU/IPT program.
DHCP	udp	request to lease an IP address (IPT only)
IP-QSIG	tcp	encapsulate QSIG message over IP network

The following is the port number used by each protocol. This is useful for filtering captured data.

RAS (Registration, Admission and Status)

	IPT	BIPU
Discovery (GRQ, GCF, GRJ)	1718	1718
Registration (RRQ, RCF, RRJ)	1719	1719

MEGACO+

			IPT		BIPU
			random		2944
RTP/RTCP
		IPT		BIPU
	RTP	1500		X (11000 – 13000). Always an even number.
	RTCP	1501		X+1. Always an odd number.

FTP/FTP-data

			BIPU (FTP client)			FTP server
	FTP		1024	(initial)		21 (well-known)
			1026	(retry)
	FTP-data		1025	(initial)		20 or any port (Depends
			1027	(retry)		on server implementation)
DHCP
		DHCP server			DHCP client (IPT)
		67			68

9-34 Strata CTX I&M 06/04