Cisco Cisco IP Contact Center Release 4.6.2 Technical References

16 

Overview 

 

For the Spectrum ACD to access the Spectrum Transaction Link port, each 
Peripheral Gateway requires a dedicated Transaction Link connection. 
This connection makes use of either the X.25 data link, which is provided 
by the PDI (I or II) card or the TCP/IP interface provided by the PDI III 
card.  

The Spectrum Transaction Link port and the PG communicate using the 
X.25 protocol at a baud rate of 19.2KB or the TCP/IP interface over LAN. 
The Spectrum PG receives and sends data over both the Supervisor CRT 
and the Transaction Link to obtain real-time call processing state 
information. 
 

The Transaction Link connection provides the majority of the information 
needed by the PG. The Transaction Link is used to support the Call State 
Event Notifications, Agent State Queries, Agent State Change 
Notifications, Agent Group Membership, and Host Routing. Call State 
Events and Agent State Change Notifications are sent unsolicited by the 
Spectrum, while Agent State Queries are initiated by the PG. Agent State 
Queries are generally issued to synchronize state when the PG first begins 
operation. The Spectrum Transaction Link Host Routing feature is used by 
the PG to implement the Unified ICM Post-Routing feature which allows 
the Unified ICM CallRouter to direct calls that have terminated on the 
Spectrum. 

The Spectrum Transaction Link must be configured to operate correctly 
with the Unified ICM. This configuration involves allowing Transaction 
Link access to Trunk Groups and the Agent classes of service targeted by 
the Unified ICM CallRouter. It is also necessary to supplement the default 
Transaction Link messages with “Inform Host” or “Inform Host Call 
Status” application vector steps in order to enhance call state tracking. 
These enhanced messages are required for proper operation of the Unified 
ICM. 

There are two choices available in the case of the Duplex PG configuration 
using TCP/IP.  

 

First is single Transaction Link configuration. Both PG A and PG B 
are configured with Transaction Link point A equal to Transaction 
point B. Both the PGs are configured to connect to the same 
Transaction Link IP address and port number as both sides are never 
actively connected to Transaction Link at the same time. Therefore, 
both the PGs should be seen as the same application by the switch. 

 

Second is Dual Transaction Link configuration. Both PGs are 
configured to different Transaction Link points. They are Transaction 
Link Ports on different Transaction Link Cards. Dual Transaction Link 
Cards configuration gives more fault tolerance in case one of the two 
Transaction Link cards goes down. Each Transaction Link Card has its 
own IP address to the network. Both PGs in Dual Transaction Link