SIP Devices Configuration

Set Up Ingress Gateway to Use Redundant Proxy Servers

Configure the gateway with the following code to send calls to redundant proxy servers as resolved using DNS SRV lookup: 

                                ip domain name <your domain name>
                                ip name-server <your DNS server>
                                sip-ua
                                sip-server dns:<your SRV cluster domain name>
                                dial-peer voice 1000 voip
                                session target sip-server

Set Up Call Server with Redundant Proxy Servers

Use redundant proxy servers for Unified CVP outbound calls by using a DNS-based SRV cluster name or a non-DNS SRV cluster name (also known as Server Group Name).

See the Operations Console User's Guide for Cisco Unified Customer Voice Portal on how to configure local based SRV records.

Local SRV File Configuration Example for SIP Messaging Redundancy

Load-Balancing SIP Calls

SIP calls can be load balanced across destinations in several different ways as outlined below:

  • Using the CUSP server, define several static routes with the same route pattern, priorities, and weights.

  • Using DNS, configure SRV records with priorities and weights. Both the DNS client and the server settings must be configured and operating successfully for DNS "A" and "SRV" type queries to work. Configure SRV queries to be used wherever outbound SIP calls are made, such as on the IOS Ingress gateway, on the Call Server itself, and on Unified CM.


Note
Refer to DNS Zone File Configuration for Comprehensive Call Flow Model for information about load balancing and failover without a Proxy Server. Only the DNS SRV method is supported for load balancing and failover without a Proxy Server.

Cisco Unified SIP Proxy (CUSP) Configuration

The following configuration shows a CUSP proxy in Unified CVP. The highlighted lines are specific to a Unified CVP solution. For additional configuration details, refer to the Configuring Cisco Unified SIP Proxy Server guide.

Configuration Example:

server-group sip global-load-balance call-id
                            server-group sip retry-after 0
                            server-group sip element-retries udp 1
                            server-group sip element-retries tls 1
                            server-group sip element-retries tcp 1
                            sip dns-srv
                            no enable
                            no naptr
                            end dns
                        !
                        no sip header-compaction
                        no sip logging
                        !
                        sip max-forwards 70
                        sip network netA noicmp
                        non-invite-provisional 200
                        allow-connections
                        retransmit-count invite-server-transaction 9
                        retransmit-count non-invite-client-transaction 9
                        retransmit-count invite-client-transaction 2
                        retransmit-timer T4 5000
                        retransmit-timer T2 4000
                        retransmit-timer T1 500
                        retransmit-timer TU2 32000
                        retransmit-timer TU1 5000
                        retransmit-timer clientTn 64000
                        retransmit-timer serverTn 64000
                        end network
                        !
                        no sip peg-counting
                        !
                        sip privacy service
                        sip queue message
                        drop-policy head
                        low-threshold 80
                        size 2000
                        thread-count 20
                        end queue
                        !
                        sip queue radius
                        drop-policy head
                        low-threshold 80
                        size 2000
                        thread-count 20
                        end queue
                        !
                        sip queue request
                        drop-policy head
                        low-threshold 80
                        size 2000
                        thread-count 20
                        end queue
                        !
                        sip queue response
                        drop-policy head
                        low-threshold 80
                        size 2000
                        thread-count 20
                        end queue
                        !
                        sip queue st-callback
                        drop-policy head
                        low-threshold 80
                        size 2000
                        thread-count 10
                        end queue
                        !
                        sip queue timer
                        drop-policy none
                        low-threshold 80
                        size 2500
                        thread-count 8
                        end queue
                        !
                        sip queue xcl
                        drop-policy head
                        low-threshold 80
                        size 2000
                        thread-count 2
                        end queue
                        !
                        route recursion
                        !
                        sip tcp connection-timeout 240
                        sip tcp max-connections 256
                        !
                        no sip tls
                        !
                        trigger condition in-netA
                            sequence 1
                            in-network netA
                            end sequence
                            end trigger condition
                            !
                            trigger condition mid-dialog
                            sequence 1
                            mid-dialog
                            end sequence
                            end trigger condition
                            !
                            trigger condition out-netA
                            sequence 1
                            out-network netA
                            end sequence
                            end trigger condition
                        !
                        accounting
                        no enable
                        no client-side
                        no server-side
                        end accounting
                        !
                        server-group sip group cucm-cluster.cisco.com netA
                         element ip-address 10.86.129.219 5060 udp q-value 1.0 weight 10
                         element ip-address 10.86.129.62 5060 udp q-value 1.0 weight 10
                         element ip-address 10.86.129.63 5060 udp q-value 1.0 weight 10
                         failover-resp-codes 503
                         lbtype global
                         ping
                         end server-group
                         !
                         server-group sip group cvp-call-servers.cisco.com netA
                         element ip-address 10.86.129.220 5060 udp q-value 1.0 weight 10
                         element ip-address 10.86.129.224 5060 udp q-value 0.9 weight 10
                         failover-resp-codes 503
                         lbtype global
                         ping
                         end server-group
                         !
                         server-group sip group vxml-gws.cisco.com netA
                         element ip-address 10.86.129.229 5060 udp q-value 1.0 weight 10
                         element ip-address 10.86.129.228 5060 udp q-value 1.0 weight 10
                         failover-resp-codes 503
                         lbtype global
                         ping
                         end server-group
                         !
                         route table cvp-route-table
                         key 9 target-destination vxml-gws.cisco.com netA
                         key 8 target-destination cvp-call-servers.cisco.com netA
                         key 7 target-destination vxml-gws.cisco.com netA
                         key 700699 target-destination cvp-call-servers.cisco.com netA
                         key 2 target-destination cucm-cluster.cisco.com netA
                         key 1 target-destination cucm-cluster.cisco.com netA
                         key 7000 target-destination 172.19.151.41 netA
                         key 777333 target-destination cvp-call-servers.cisco.com netA
                         key 1004 target-destination 10.86.139.84 netA
                         key 7105 target-destination dialer-gws netA
                         end route table
                         !
                         policy lookup cvp-policy
                         sequence 1 cvp-route-table request-uri uri-component user
                         rule prefix
                         end sequence
                         end policy
                         !
                         trigger routing sequence 1 by-pass condition mid-dialog
                         trigger routing sequence 10 policy cvp-policy condition in-netA
                         !
                         server-group sip ping-options netA 10.86.129.200 5038
                         method OPTIONS
                         ping-type adaptive 5000 10000
                         timeout 500
                         end ping
                         !
                         server-group sip global-ping
                         sip listen netA udp 10.86.129.200 5060
                        !
                        end

Configure Custom Streaming Ringtones

You can configure custom ringtone patterns that enable you to play an audio stream to a caller in place of the usual ringtone. Customized streaming ringtones are based on the dialed number destination and, when configured, play an in-progress broadcast stream to the caller while the call is transferred an agent.

Procedure

Step 1

Configure Helix for streaming audio.

The default installation and configuration of the Helix server is all that is required for use with Unified CVP. See the Helix Server Administration Guide for information about installing and configuring the Helix Server.

Step 2

In the Operations Console, perform the following steps to configure custom streaming ringtones:

  1. Select System > Dialed Number Pattern .

  2. Click Add New.

  3. Complete the following fields to assoicate a dialed number pattern with a custom ringtone.

    Table 1. Dialed Number Pattern Configuration Settings

    Property

    Description

    Default

    Value

    General Configuration

    Dialed Number Pattern

    The actual Dialed Number Pattern.

    None

    Must be unique

    Maximum length of 24 characters

    Can contain alphanumeric characters, wildcard characters such as exclamation point (!) or asterisk (*), single digit matches such as the letter X (not x) or period (.)

    Can end with an optional greater than (>) wildcard character

    Description

    Information about the Dialed Number Pattern.

    None

    Maximum length of 1024 characters

    Enable Custom Ringtone

    Enables customized ring tone.

    • Ringtone media filename - Enter the name of the file that is to be played for the respective dialed number pattern. Provide the URL for the stream name in the following format: rtsp://<streaming server IP address>:<port>/<directory>/<filename>.rm

    Disabled

    none

    Maximum length of 256 characters

    Cannot contain whitespace characters

  4. Click Save to save the Dialed Number Pattern.

    You are returned to the Dialed Number Pattern page. To deploy the Dialed Number Pattern configuration, click Deploy to deploy the configuration to all Unified CVP Call Server devices.

  5. Access the IOS device in global configuration mode and add the following commands on your VXML Gateway:

    rtsp client timeout 10

    rtsp message timeout 10

    The range is 1 to 20; the recommended value is 10 seconds.

Step 3

Add a Send to VRU node in your ICM script before any Queue node.

The explicit Send to VRU node is used to establish the VRU leg before the transfer to the agent; this is required to play streaming audio ringtones to a caller.