Cisco Cisco Unified IP Interactive Voice Response (IVR) 8.0(1) Release Note

Quality of Service (QoS) becomes an issue when more voice and application-related traffic is added to 
an already growing amount of data traffic on your network. Accordingly, Cisco Unified CCX and 
time-sensitive traffic such as voice need higher QoS guarantees than less time-sensitive traffic such as 
file transfers or emails (particularly if you are using a converged network).

QoS should be used to assign different qualities to data streams to preserve Cisco Unified CCX 
mission-critical and voice traffic. The following are some examples of available QoS mechanisms:

Packet classification and usage policies applied at the edge of the network, such as Policy Based 
Routing (PBR) and Committed Access Rate (CAR).

End-to-end queuing mechanisms, such as Low Latency Queuing (LLQ). Because voice is 
susceptible to increased latency and jitter on low-speed links, Link Fragmentation and Interleaving 
(LFI) can also be used to reduce delay and jitter by subdividing large datagrams and interleaving 
low-delay traffic with the resulting smaller packets.

Scheduling mechanisms such as Traffic Shaping to optimize bandwidth utilization on output links. 

 and the following section list TCP ports and DSCP markings for use in prioritizing Cisco 

Unified CCX and Cisco Unified CM mission-critical CTI traffic. The DSCP Markings for call signaling 
traffic between Cisco Unified CCX and Cisco Unified Communication manager and for voice traffic 
played from the Unified CCX server are set by default according to the recommended traffic 
classification guidelines documented in Cisco Unified Communications System Design Guidance, 
available at: 

. 

The performance criteria used in classifying such traffic includes:

No packet drops on the outbound or inbound interface of the WAN edge router

Voice (G.729) loss under 1%

One-way voice delay under 150 msecs

A detailed description of QoS is not within the scope of this design guide. For QoS design 
recommendations, refer the Quality of Service design guide available at: 

CTI messaging between Cisco Unified CCX Cisco Unified CM 
Telephony subsystem and Cisco Unified CM (both directions)

CTIQBE

TCP 2748

CS3

HTTP (Cisco Unified CCX administration page and IPPA interface)

HTTP

TCP 6293

AF21

AXL to Cisco Unified CM for User configuration and authentication 
(SSL)

SOAP AXL

TCP 8433

AF21

E-mail

SMTP

TCP 25

CS0

Messaging data between Cisco Unified CCX and Cisco Agent Desktop CTI

TCP 42027

CS3

IMAP

1

1.

This is for Cisco Unified CCX Agent E-mail feature and does not apply to Cisco Agent Desktop Browser edition and IP Phone Agent

TCP 143

CS0