September 9, 2026
Webex with Daisy Hosted Voice uses separate session border controls (SBCs) and API gateways.
On Gamma’s side, Daisy Hosted Voice (DHV) is referred to as Horizon, which is why the word Horizon is used in domain names
Gamma services
The Webex client apps require access to Cisco Webex services, as detailed below:
| IP address range | Protocols and ports | Function |
| 151.2.128.0/19 | TCP 443 | HTTPS APIs |
| 151.2.128.0/19 138.248.17.0/24 138.248.19.128/25 | TCP 5082,
UDP 10000 – 60000 |
SIPS signalling,
SRTP media |
If DNS based filtering is used, then access to the below domains should be allowed:
| Domain | Function |
| *. pub.uhorizon.cloud | Gamma Cloud Services |
SBC Discovery
DNS SRV records are used to provide high-availability service for Webex client applications. DNS SRV records resolve to two or more DNS A-records, which in turn resolve to IP addresses of Horizon Access SBCs.
In the domain names below each X refers to any digit
| Domain Name | Record Type | Service Name | Protocol | Port |
| wasXXhjXX.pub.uhorizon.cloud
Example: _sips._tcp.was03hj01.pub.uhorizon.cloud |
SRV | SIPs | UDP | 5082 |
| wasXXjhXX.pub.uhorizon.cloud
Example: _sips._tcp.was03jh01.pub.uhorizon.cloud |
SRV | SIPs | UDP | 5082 |
| wasXXptXX.pub.uhorizon.cloud
Example: _sips._tcp.was04pt01.pub.uhorizon.cloud |
SRV | SIPs | UDP | 5082 |
| wasXXtpXX.pub.uhorizon.cloud
Example: _sips._tcp.was04tp01.pub.uhorizon.cloud |
SRV | SIPs | UDP | 5082 |
Webex Services
| Destination | Protocols & Ports | Function |
| See Webex service domains below | TCP 443 | HTTPS signalling and APIs |
| See Webex media services below | UDP 5004 & 9000 | SRTP media |
| Any | UDP 123 | NTP, not required if NTP available within customer network |
| Any | UDP 53 TCP 53 | DNS, not required if DNS available within customer network |
Webex service domains
| Domain/URL | Function |
| *.webex.com
*.cisco.com *.wbx2.com *.ciscospark.com *.webexapis.com |
Webex micro-services |
| *.webexcontent.com | Webex user content storage |
| *.accompany.com | People Insights Integration |
| *.sparkpostmail1.com
*.sparkpostmail.com |
E-mail service |
| *.giphy.com | GIF image sharing |
| safebrowsing.googleapis.com | URL safety checking |
| msftncsi.com/ncsi.txt captive.apple.com/hotspot-detect.html | Internet connectivity checking |
| *.appdynamics.com
*.eum-appdynamics.com |
Performance tracking |
| *.amplitude.com | Testing metrics |
| *.slido.com
*.sli.do *.data.logentries.com slido-assets-production.s3.eu-west-1.amazonaws.com |
Slido add-in |
| *.quovadisglobal.com
*.digicert.com *.godaddy.com *.identrust.com *.lencr.org *.intel.com |
Certificate revocation lists |
| *.google.com
*.googleapis.com |
Notifications to mobile apps |
| cdnjs.cloudflare.com
cdn.jsdelivr.net static2.sharepointonline.com appsforoffice.microsoft.com |
Webex Scheduler for Microsoft Outlook |
Webex Media services
| IP Address Range | Function |
| 66.114.160.0/20
66.163.32.0/19 69.26.160.0/19 114.29.192.0/19 144.196.0.0/16 150.253.128.0/17 163.129.0.0/16 170.72.0.0/16 170.133.128.0/18 173.39.224.0/19 23.89.0.0/16 173.243.0.0/20 207.182.160.0/19 44.234.52.192/26 209.197.192.0/19 210.4.192.0/20 62.109.192.0/18 216.151.128.0/19 64.68.96.0/19 |
Webex meetings media |
