Cisco Systems ATA186I2ARF manual Bit Number Definition

Chapter 5 Parameters and Defaults

Operating Parameters

Table 5-4 ConnectMode Parameter Bit Definitions (continued)

Bit Number	Definition
17—SIP only	0/1—Disable/enable call forwarding performed by the Cisco ATA. In SIP, call forwarding can be
	performed locally by the Cisco ATA or it can be performed by the SIP proxy. If this bit is disabled, the
	Cisco ATA forwards the entire dial string, including service activation code, to the SIP proxy for
	processing.
18—SIP only	0/1—Disable/enable SIP call return performed by the Cisco ATA.
19	0/1—Disable/enable the Cisco ATA to send a ringback tone to the caller.
20—SIP only	0/1—Disable/enable SIP to perform action=proxy in a REGISTER message.
21—SIP only	0/1—Disable/enable SIP to perform action=redirect in a REGISTER message.
22—SIP only	0/1—Disable/enable SIP to process a received= tag in the VIA header to extract the exernal IP addresses
	used by the Network Address Translation (NAT) router.
	When the Cisco ATA is operating behind a NAT, the NATIP parameter must be set to the external IP
	address of the NAT router. This allows the correct IP address to be placed in the Contact and SDP
	headers.
	In release 2.14 or later, you may leave the NAT IP address at the default value of "0" or "0.0.0.0" and let
	the ATA automatically scan the Via header for a "received=" parameter. The parameter, if present, would
	indicate that the Cisco ATA is operating behind a firewall.
	The Cisco ATA proceeds as follows:

1.If the "received=" parameter is in an INVITE response, the current INVITE is canceled and a new INVITE is sent with the new IP address extracted from the "received=<NAT IP address>" parameter in the Contact and SDP headers.

In addition, the Cisco ATA will cancel all previous registrations and re-register with the new IP address in the Contact header. This step is performed only if registration is currently in an idle state.

2.If the "received=" parameter is in a REGISTER response as a result of a REGISTER command, the Cisco ATA will cancel all previous registrations and re-register with the new IP address extracted from the "received=<NAT IP address>" parameter in the Contact header.

Note For the Cisco ATA to automatically detect its presence behind a NAT, the SIP proxy server or remote user agent server must include the "received=" parameter in the Via header in the responses to the Cisco ATA if the proxy detects that the source address and port do not match those in the Via header.

23	0/1—Disable/enable the end user to specify the default call waiting state for every call. This can be done
	on a permanent basis.
24	0/1—Disable/enable the mixing of audio and call waiting tone during a call.
25—SIP only	0/1—Disable/enable DNS lookup of hostname “From” header hostname for call return.
26 to 31	Reserved.

Note You cannot simultaneously set bits 20 and 21 to 1. Also, if you set both these bits 0, the action parameter is not included in the REGISTER message, forcing the proxy server to perform the next step in the call process.

Cisco ATA 186 and Cisco ATA 188 Analog Telephone Adaptor Administrator’s Guide (SIP)

OL-3410-01 5-29