User`s guide

40 Dialogic
®
Host Media Processing Software Release 4.1LIN Release Guide
Programming Libraries
application can let the far end UA request the bit rate. Feature enablement and
disablement can be controlled either at the IPT board-level device or the IPT network
device (channel).
Overlap-receive support for limited SIP-I interworking scenarios
Provides a method for handling overlap-receive SIP calls, where called party
addressing is supplied in multiple INVITEs but needs to be propagated to the
application as standard en bloc signaling calls.
Processing multiple 18x provisional responses
Provides a method for obtaining subsequent provisional 18x SIP responses using the
GCEV_EXTENSION event.
Registering authentication data without realm string
Provides a method for registering authentication data without using realm string.
Handling non-2xx responses to T.38 switch
Provides 1PCC Global Call support for RFC 3261 compliance for non-2xx responses
to re-INVITE requests to switch to or from audio to T.38 fax and back.
WaitCall cancellation
The application can block the channel from accepting calls before making an
outbound call. If an incoming call is already in progress, the application is notified and
the call in progress is not affected.
Defer sending SIP messages
The application can delay sending the appropriate response to an incoming BYE
request (such as 200OK), as well as delay the sending of a BYE request.
Dynamic selection of outbound SIP proxy
The application can select an outbound SIP proxy server on the Dialogic
®
HMP virtual
board device dynamically. If an outbound SIP proxy server was selected at board
initialization it will be overridden; otherwise it will be selected for the first time.
Once enabled, this feature applies to the following outgoing SIP requests, in addition
to SIP responses out of Dialogic
®
HMP Software:
– 1PCC mode
ACK, INFO, INVITE, OPTIONS, REFER, REGISTER, BYE, NOTIFY,
SUBSCRIBE and CANCEL.
– 3PCC mode
ACK, INFO, INVITE, OPTIONS, REFER, REGISTER, BYE, NOTIFY,
SUBSCRIBE, UPDATE, PRACK and CANCEL.
Retrieving SIP inbound RFC 2833 payload type
The application can retrieve the RFC 2833 payload type value specified by a remote
SIP user agent, using Global Call first party call control (1PCC). Since the ability to set
the RFC 2833 payload type on outgoing media streams is already available in 1PCC,
applications can take advantage of this feature to match the outgoing RFC 2833
payload type with the RFC 2833 payload type of the incoming media stream, if its
mapping is available in an incoming Session Description Protocol (SDP).