register message (SCCP) from a ipphone.

[sarahr202]

Hi everybody

Please consider the following:

Iphone1------------CME/tftp

CME router has following config:

telephony-service

load 7960-7940 P00308000500

max-ephones 4

max-dn 4

ip source-address 201.201.201.1 port 2000

cnf-file location flash:

max-conferences 4 gain -6

transfer-system full-consult

create cnf-files version-stamp Jan 01 2002 00:00:00

!

!

ephone-dn 1

number 20001

!

!

ephone-dn 2

number 20002

!

!

ephone 1

mac-address 0006.537B.84EF

button 1:1

!

!

!

ephone 2

mac-address 0006.28F0.F7E7

button 1:2

=================================

The cisco ipphone1 i(201.201.201.11) issending CME( 201.201.201.1) following register message.

No.     Time        Source                Destination           Protocol Length Info
    405 107.462363  201.201.201.11        201.201.201.1         SKINNY   130    RegisterMessage

Frame 405: 130 bytes on wire (1040 bits), 130 bytes captured (1040 bits)
Ethernet II, Src: Cisco_7b:84:ef (00:06:53:7b:84:ef), Dst: Cisco_37:8a:c0 (00:12:d9:37:8a:c0)
Internet Protocol Version 4, Src: 201.201.201.11 (201.201.201.11), Dst: 201.201.201.1 (201.201.201.1)
Transmission Control Protocol, Src Port: 49824 (49824), Dst Port: cisco-sccp (2000), Seq: 105, Ack: 1, Len: 76
Skinny Client Control Protocol
    Data length: 68
    Header version: Basic (0x00000000)
    Message ID: RegisterMessage (0x00000001)
    Device name: SEP0006537B84EF
    Station user ID: 0
    Station instance: 1
    IP address: 201.201.201.11 (201.201.201.11)
    Device type: TelecasterBus (8)
    Max streams: 0

I just want to know if Station instance is 1 because of these commands :

ephone 1

mac-address 0006.537B.84EF

button 1:1

ephone-dn 1

number 20001

thanks and havea great day.

[Harmit Singh · Accepted solution]

Hi Sarah,

This doesnt appear to have anything to do with the ephone or ephone-dn config. I took a pcap for a CIPC and I see

"StationInstance: 0" whereas the ephone tag for this phone is 3. It could possibly be associated with the phone type/model or the skinny load it is running, since this is a register message coming from the endpoint.

http://www.wireshark.org/docs/dfref/s/skinny.html

Field name	Type	Description	Versions

skinny.stationInstance

Unsigned integer, 4 bytes

Station instance

1.0.0 to 1.8.3

There isnt much documentation on it apparently.

HTH.

Regards,

Harmit.