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Using Third Party IP Stacks
November 2009 263
Outbound Call
The following section uses SIP to demonstrate the interaction
between the third party stack in the application and Bfv for
negotiating RTP and T.38 for an outbound call.
Systems that will perform RTP can generate the CNG tone and
avoid setting the RTP on the Bfv. If this is the case applications can
skip calling BfvCallSwitchConnectIP(Listen RTP local IP/Port),
BfvCallSWConnectIP(FullDuplex RTP),
BfvLineCallProgressEnable() Generates CNG, and
BfvLineCallProgressDisable.
If RTP is also going to be done with the Bfv, make sure the port used
in BfvCallSWConnectIP is unused.
If both RTP and T.38 are done with Bfv, some ICMP errors may
appear as the port is switched from RTP to T.38. To avoid the ICMP
errors use unique ports for RTP and T.38.
Figure 24. Outbound SIP Sequence