Category Archives: Cisco PGW2200

NETIND Network Indicator

The network indicator assigned by the network administrator. Value range: 0 (default) through 3.

0 is for international networks
1 is for spare
2 is for national networks
3 is reserved for national use.

ISUP Messages Descriptions

Initial address message (IAM) — First message sent to inform the partner switch that a call has to be established on the CIC contained in the message. Contains the called number, type of service (speech or data) and optional parameters.

Subsequent address message (SAM) — For networks that support overlap dialing procedures, and then in the case that the IAM did not contain the full called number, one or more SAMs follow containing additional digits. This message is not supported by networks that only support en bloc dialing procedures.

Address complete message (ACM) — Message returned from the terminating switch when the subscriber is reached and the phone starts ringing, or when the call traverses an interworking point and the intermediate trunk is seized.

Call progress (CPG) — Contains additional information about the progress of a call. Normally sent after the ACM when the status of the call changes from that reported in the ACM.

Answer message (ANM) — Sent when the subscriber picks up the phone, a resource is connected or answer supervision is returned by an interworking point. Normally charging starts at this moment. It is required that the call be cut through in both directions by this point.

Connect (CON) — Sent when the call is answered by an automatic terminal. This message replaces the ACM, CPG and ANM for calls that are answered by automatic terminals.

Release (REL) — Sent to clear the call when a subscriber goes on hook. This is also sent (in direct response to an IAM) if the terminating switch determines that the call cannot be completed. In either case, the terminating switch provides a cause value in the message to explain the reason for the release, e.g., "User busy".

Release complete (RLC) — Acknowledgment of the release – the circuit is idle afterward and can be used again.

Chargen DoS Attack

If you were to encounter a Chargen DoS attack from your Sun Server, disable this service as it is not required.

Edit the file below an remark by adding a pound sign before each line containing chargen.
Restart service or reboot server.

vi /etc/inet/inetd.conf

# Echo, discard, daytime, and chargen are used primarily for testing.
#
echo stream tcp6 nowait root internal
echo dgram udp6 wait root internal
discard stream tcp6 nowait root internal
discard dgram udp6 wait root internal
daytime stream tcp6 nowait root internal
daytime dgram udp6 wait root internal
#chargen stream tcp6 nowait root internal
#chargen dgram udp6 wait root internal

Source:
http://www.deer-run.com/~hal/SolarisWebcast.pdf

183 with SDP (early media)

To force PGW on call control mode to send 183 with SDP (early media) use support183="4".
See sample below.

USE VIRTUAL SIP IP:
prov-add:sippath:name="sip-path-1",MDO="IETF_SIP"
prov-add:siplnk:name="sip-lnk-1",IPADDR="Virtual_IP_Addr1",PORT=5060,PRI=1,svc="sip-path-1"

prov-add:trnkgrp:name="100",svc="sip-path-1",type="SIP_IN"
prov-add:TRNKGRPPROP:name="100",Localport="5060",CustGrpId="1111",support183="4"
prov-ed:TRNKGRPPROP:name="100",mgcdomain="10.34.2.100",compressiontype="1",support183="4"

Provision the property support183 on the incoming trunk group.

•If the terminating side cannot play the remote ringback tone, you can provision the support183 property:

–0 (183 not supported) = The Cisco PGW 2200 Softswitch sends a 180 Ringing without SDP.
–1 (Q1912.5 supported without SDP in 180 message) = The Cisco PGW 2200 Softswitch sends a 180 Ringing without SDP.
–2 (Q1912.5 supported with InbandInfo check) = The Cisco PGW 2200 Softswitch sends a 180 Ringing without SDP.
–3 (183 supported) = The Cisco PGW 2200 Softswitch sends a 180 Ringing without SDP.

•If the terminating side can play the remote ringback tone and the alerting signaling includes the InbandInfo indicator, you can provision the support183 property:

–2 (Q1912.5 supported with InbandInfo check) = The Cisco PGW 2200 Softswitch sends a 180 Ringing with SDP.
–3 (183 supported) = The Cisco PGW 2200 Softswitch sends a 183 Session Progress with SDP.
–4 (always send 183) = The Cisco PGW 2200 Softswitch sends a 183 Session Progress with SDP.
–5 (Q1912.5 supported) = The Cisco PGW 2200 Softswitch sends a 180 Ringing with SDP.

•If the terminating side can play the remote ringback tone but the alerting signaling does not include the Inbandinfo indicator, you can provision the support183 property:

–4 (always send 183) = The Cisco PGW 2200 Softswitch sends a 183 Session Progress with SDP.
–5 (Q1912.5 supported) = The Cisco PGW 2200 Softswitch sends a 180 Ringing with SDP.