14.3.1.1.1. Connectivity to OpenScape Voice 
For connectivity with OpenScape Voice only the protocol SIP-Q V2 is
supported. SIP-Q V2 supports TLS (Transport Layer Security for signaling)
and SRTP (secure RTP for the payload).
SIP-Q is also used for the connectivity with OpenExchange providing
a very powerful and scalable IP LCR.
For SIP-Q connectivity towards OpenScape Voice the block-dial mode
in OpenScape 4000 LCR and for the subscribers must be configured. Two
block-dial modes are supported:
- like a SIP Phone in an OpenScape Voice solution.
- like the existing OpenScape 4000 bock-dial mode (as known up to OpenScape 4000 V4).
IMPORTANT:
For the OpenStage 60 and 80 HFA the block dial mode has
been released with OpenStage HFA V2.
Features with SIP-Q V2 between HiPath 4000/OpenScape 4000 and OpenScape Voice
- Call identification
- Call transfer
- Call hold / retrieve / toggle
- Call Forwarding
- CFU (call forwarding unconditional)
- CFB (call forwarding on busy)
- CFNR (call forwarding no reply)
- Callback on busy subscriber / no reply
- Message Waiting Indication (MWI)
- Release links (also called route optimization or path replacement)
- Transmission of "CorNet-NQ" messages
- IPv6 (see "OpenScape 4000 SoftGate" > Chapter 12, “IPv6”)
- Signaling (TLS) and payload encryption (SRTP) (see "Signaling and Payload Encryption (SPE)")
- Call data recording
- T.38 fax connections (e.g. for SIP-Q trunking in common gateway HG 3500 towards OpenScape Voice V4/V5)