Cisco Unified Communications Manager Express (CME) is a feature-rich and software-based entry-level telephony solution that is integrated directly into Cisco IOS, allowing small-businesses or small enterprise branches to deploy and manage voice and data on a single platform.
Cisco CME routers to deliver key-system or hybrid PBX functionality, providing almost all standard telephony features, as well as many advanced features not available with traditional telephony solutions.
Additional documentation:
Instructions for configuring a CME credentials trunk
This guide will help you establish a connection between Cisco CME, and your Telnyx Mission Control Portal by showing you a sample trunk configuration using IP authentication. This assumes you've already completed the installation and telecommunication-applications deployment, per the pre-requisites.
In this activity you will:
Pre-requisites
Your IP network is operational and you can access Cisco web.
You have a valid Cisco.com account.
You have access to a TFTP server for downloading files.
Cisco router and all recommended services hardware for Cisco Unified CME is installed. For installation information, see Install Cisco Voice Services Hardware
Recommended Cisco IOS IP Voice or higher image is downloaded to flash memory in the router. To determine which Cisco IOS software release supports the recommended Cisco Unified CME version, see Cisco Unified CME and Cisco IOS Software Compatibility Matrix. For installation information, see Install Cisco IOS Software
Cisco IOS® Version 15.1(2)T and later
To make outbound calls, Telnyx requires either a valid caller ID from your device or a caller ID override enabled on your SIP connection.
Have already made the main Cisco CME installation and telecommunication-applications deployment.
Video Walkthrough
Setting up your Telnyx SIP trunk:
Note: Video walkthrough for Cisco CME configuration coming soon. Check back as we update our docs. |
1. Configure a Dial-Peer to Telnyx
This is the layout of our set-up:
Telnyx<--->CUBE<--->CUCM
Dial-peer configuration
In global configuration mode
dial-peer voice 100 voip ! 100 is an arbitrary number
translation-profile incoming 100 ! Used to translate DIDs to extensions
destination-pattern 1[2-9]..[2-9]...... !general pattern for an outgoing 11 digit calling
session protocol sipv2
voice-class sip profiles 1 ! Refers to pre-configured sip profile. Used to modify headers
session target ipv4:192.76.120.10 ! or replace with sip.telnyx.com
incoming called-number 1[2-9]..[2-9]...... !Pattern-match for incoming DIDs
dtmf-relay rtp-nte cisco-rtp sip-kpml sip-notify
voice-class codec 1 ! 1 Refers to a pre-configured ordered list of codecs
In some versions of IOS, you can whitelist SIP IPs as follows:
In global configuration mode
voice service voip
ip address trusted list
ipv4 192.76.120.10
ipv4 64.16.240.36 !Media IP address
Specify general SIP parameters
In global configuration mode
voice service voip
mode cme
allow connections sip to sip ! Permit SIP to SIP calls
sip
bind all source-interface !Bind control and medial to an interface with a IP, if one is available
early-offer forced
midcall-signaling passthru
Configure codec preference
In global configuration mode
voice class codec 1
codec preference 1 g711ulaw
codec preference 2 g711alaw
codec preference 3 g729br8
NAT Traversal
If your CUBE is behind a NAT and does not have a public IP, you need to modify the IPs in the SIP messages to your public IP using SIP Profiles as shown below:
In global configuration mode
voice class sip-profiles 1
response ANY sip-header Contact modify "172.x.y.z" "1.2.3.4" !1.2.3.4 Public IP; 172.x.y.z Private IP of the CME
request ANY sip-header Contact modify "172.x.y.z" "1.2.3.4"
response ANY sdp-header Audio-Connection-Info modify "172.x.y.z" "1.2.3.4"
response ANY sdp-header Connection-Info modify "172.x.y.z" "1.2.3.4"
response ANY sdp-header Session-Owner modify "172.x.y.z" "1.2.3.4"
request ANY sdp-header Audio-Connection-Info modify "172.x.y.z" "1.2.3.4"
request ANY sdp-header Connection-Info modify "172.x.y.z" "1.2.3.4"
request ANY sdp-header Session-Owner modify "172.x.y.z" "1.2.3.4"
This can then be applied either globally to the general sip config or under the dial-peer config using:
voice-class sip profiles 1
Additionally, it is advisable to define a loopback interface and configure it with your public IP address. Do not advertise this into your network though, as it may cause other problems.
In global configuration mode
interface loopback 0
ip address 50.249.214.241 255.255.255.0
Inbound calling:
Use translation rules and translation profiles to translate your DIDs to extensions.
Create a voice translation rule. For example, the rule below translates 13125489677 to 3005
In global configuration mode
voice translation-rule 100
rule 1 /13125489677/ /3005/ ! Several rules can be defined. In this case, 3005 is an extension on CUCM
Create a translation profile using the rule created:
In global configuration mode
voice translation-profile 100
translate called 100
Apply the translation profile to the dial-peer:
translation-profile incoming 100
That's it, you've now completed the configuration of your Cisco CUBE/CUCM SIP Trunk
Additional Resources
Review our getting started with guide to make sure your Telnyx Mission Control Portal account is setup correctly!
Additionally, check out: