What Can Enterprise Customers Do when Room Join Failure, Silence or Black Screen Occurs During SparkRTC Calls?

Enterprise users usually have network security settings, which may cause SparkRTC call failures.

Check the internal network first to ensure that the customer's network can communicate with the public network. Alternatively, the firewall must meet the following requirements:

1. Access restrictions for all IP addresses.
2. Configure the SparkRTC port and domain name whitelists for the client firewall.
   • Configure the SparkRTC port whitelist for the firewall, as shown in Table 1.

     Table 1 Port whitelist for the firewall

     Port Type	Port
     TCP	443, 6447
     UDP	20000–20063

   • Configure the SparkRTC domain name whitelist for the firewall, as shown in Table 2.

     Table 2 Domain name whitelist for the firewall

     No.	Domain Name
     1	*.dbankcdn.com
     2	*.dbankcdn.cn
     3	*.dbankcloud.ru
     4	*.dbankcloud.cn
     5	*.dbankcloud.com
     6	*.hicloud.cn
     7	*.hicloud.com
     8	*.dbankedge.cn

If the problem persists, you are advised to submit a service ticket for Huawei Cloud technical support.