Cisco ASA 5505 - Manual (Page 938)

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Cisco ASA 5500 Series Configuration Guide using the CLI
Chapter 44 Configuring Inspection for Voice and Video Protocols
Skinny (SCCP) Inspection
b. To enforce registration before calls can be placed, enter the following command:
hostname(config-pmap-p)# enforce-registration
c. To set the maximum SCCP station message ID allowed, enter the following command:
hostname(config-pmap-p)# message-ID max hex_value
Where the hex_value argument is the station message ID in hex.
d. To check RTP packets flowing on the pinholes for protocol conformance, enter the following
command:
hostname(config-pmap-p)# rtp-conformance [enforce-payloadtype]
Where the enforce-payloadtype keyword enforces the payload type to be audio or video based on
the signaling exchange.
e. To set the maximum and minimum SCCP prefix length value allowed, enter the following command:
hostname(config-pmap-p)# sccp-prefix-len {max | min} value_length
Where the value_length argument is a maximum or minimum value.
f. To configure the timeout value for signaling and media connections, enter the following command:
hostname(config-pmap-p)# timeout
The following example shows how to define an SCCP inspection policy map.
hostname(config)# policy-map type inspect skinny skinny-map
hostname(config-pmap)# parameters
hostname(config-pmap-p)# enforce-registration
hostname(config-pmap-p)# match message-id range 200 300
hostname(config-pmap-p)# drop log
hostname(config)# class-map inspection_default
hostname(config-cmap)# match default-inspection-traffic
hostname(config)# policy-map global_policy
hostname(config-pmap)# class inspection_default
hostname(config-pmap-c)# inspect skinny skinny-map
hostname(config)# service-policy global_policy global
Verifying and Monitoring SCCP Inspection
The show skinny command assists in troubleshooting SCCP (Skinny) inspection engine issues. The
following is sample output from the show skinny command under the following conditions. There are
two active Skinny sessions set up across the ASA. The first one is established between an internal Cisco
IP Phone at local address 10.0.0.11 and an external Cisco CallManager at 172.18.1.33. TCP port 2000
is the CallManager. The second one is established between another internal Cisco IP Phone at local
address 10.0.0.22 and the same Cisco CallManager.
hostname# show skinny
LOCAL FOREIGN STATE
---------------------------------------------------------------
1 10.0.0.11/52238 172.18.1.33/2000 1
MEDIA 10.0.0.11/22948 172.18.1.22/20798
2 10.0.0.22/52232 172.18.1.33/2000 1
MEDIA 10.0.0.22/20798 172.18.1.11/22948