Use this entry to specify which protocol is used to encrypt the data streams.
- SNMP ID:
- 2.33.4.1.1.28
- Console path:
- Setup > Voice-Call-Manager > Lines > SIP-Provider > Line
- Possible values:
- Auto
- NAPTR (Naming Address Pointer) records are used for DNS resolution. In the DNS data, the provider specifies the use of transport protocols such as UDP, TCP or TLS. The provider can also specify weights or priorities. If TLS is specified as the transport protocol for signaling encryption by NAPTR, voice encryption is also used automatically, regardless of the explicit configuration setting of voice encryption.
- UDP
- All SIP packets are transmitted connectionless. Most providers support this setting.
- TCP
- All SIP packets are transmitted connection-oriented. The device establishes a TCP connection to the provider and maintains it for as long as it stays registered. Specialized providers, such as the providers of SIP trunks, support or force this setting.
- TLSv1
- TLSv1.1
- TLSv1.2
- TLSv1.3
- Transmission is the same as with TCP, but all of the SIP packets are encrypted all the way to the provider. The TLS version selected in the configuration is taken as the minimum requirement for TLS encryption.
- Default:
- Auto
