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The

Spacevars
0 series4

supports a subset of the functionality required for a full-ICE agent:

• In controlling role,

• the

  Spacevars
  0 product

  initiates connectivity check with a STUN Binding Request. The connectivity check by

• the

  Spacevars
  0 product

  is sent in response to the first connectivity check, which is received from the peer.

• The

  Spacevars
  0 product

  selects the remote Ip address for media based on the address signaled in the first STUN Binding Request, which is received from the peer. To assert the selection of media,

• the

  Spacevars
  0 product

  sends STUN Binding Request with the USE-CANDIDATE attribute.
• In controlled role,

• the

  Spacevars
  0 product

  initiates a single connectivity check with a STUN Binding Request to the peer. This request is sent after receiving a Binding Request from the peer, which contains the USE-CANDIDATE attribute. This behavior is important to complete the full-ICE procedures when inter-operating with WRTC peers such as Google and Chrome.
• In controlling role,

• the

  Spacevars
  0 product

  protects against network loss of STUN message exchanges by introducing internal guard timers and sends STUN Keep-Alive messages at a configurable interval. This functionality is based on the procedures defined in RFC5245.

These functionalities allow

the

When inter-operating with Lync endpoints, which require their own flavor of ICE, this feature extends the existing

• Allows specification of IPv6 candidates at Signaling and in STUN messages.
• Validates the received STUN messages and attributes based on the MS-ICE2 standards.
• Protects against network loss of STUN message exchanges by introducing internal guard timers and sends STUN Keep-Alive messages at a configurable interval.

The

• Timers
• Re-INVITE Generation

Anchor
Connectivity Check Timers Connectivity Check Timers

Timers

In pseudo full-ICE and MS-Lync ICE configuration,

the

The

• Connectivity Check Phase 1 Timer

• Connectivity Check phase 2 Timer

• USE-CANDIDATE Check Timer
• Keep-Alive Timer

Controlling Role

The

Spacevars
0 product

assumes the controlling role when the controlled attribute is received in Binding Request for a media stream. In the controlling role,

the

the

The

the

Controlled Role

The

Spacevars
0 product

assumes the controlled role when the controlling attribute is received in Binding Request for a media stream.

When a STUN Binding Request with USE-CANDIDATE is received,

the

the

the

the

The following table describes the behavior of the timers:

A new parameter iceKeepaliveTimer is added to Network Address Translator (NAT) Traversal of SIP Trunk Group to enable Keep-Alive timer for ICE. This parameter is supported for Keep-Alive message on RTP port in Lync mode and RTP and RTCP ports in full-ICE mode.