Dialogic IP Media Library API Programming Guide and Library ...

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6.Error Handling This chapter describes error handling for the Dialogic ® IP Media Library API software. All Dialogic ® IP Media Library API functions return a value that indicates the success or failure of the function call. Success is indicated by a return value of zero or a non-negative number. Failure is indicated by a value of -1. If a function fails, call the Standard Attribute functions ATDV_LASTERR( ) and ATDV_ERRMSGP( ) for the reason for failure. These functions are described in the Dialogic ® Standard Runtime Library API Library Reference. If an error occurs during execution of an asynchronous function, the IPMEV_ERROR event is sent to the application. No change of state is triggered by this event. Upon receiving the IPMEV_ERROR event, the application can retrieve the reason for the failure using the standard runtime library functions ATDV_LASTERR( ) and ATDV_ERRMSGP( ). Dialogic ® IP Media Library API Programming Guide and Library Reference 30 Dialogic Corporation 6
7.Reserving Resources for Audio Coders This chapter describes how to reserve resources for audio coders. Topics include: Feature Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Reserve Resources for Outbound Call. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Reserve Resources for Inbound Call . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33 Release Resources Implicitly by a Subsequent Reservation Call . . . . . . . . . . . . . . . . . 34 Handling a Resource Reservation Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Reservation State after a Subsequent Call to Resource Reservation Fails . . . . . . . . . . 37 7.1 Feature Description When working with audio coders, it is necessary to reserve resources for these coders prior to invoking the ipm_StartMedia( ) function to enable Dialogic ® software to use resources more efficiently. It is also good practice to release these resources after the call is completed. Several scenarios are provided to explain how to reserve and release audio coder resources. The Dialogic ® IP Media Library API (ipm_ API functions) and the Dialogic ® Device Management API (dev_ API functions) are used in these scenarios. Note: The Device Management API _Ex functions described in this chapter are not supported on Dialogic ® Host Media Processing (HMP) Software Release 3.0 for Windows. 7.2 Reserve Resources for Outbound Call The following steps describe a sample scenario in which an application reserves resources for an outbound call: 1. Issue dev_GetResourceReservationInfoEx( ) to query and get the current reservation information for the specified resources and device. The information is provided in the DEV_RESOURCE_RESERVATIONINFO_EX structure. 2. Issue dev_ReserveResourceEx( ) to reserve coders; for example, RESOURCE_IPM_G711_20MS, RESOURCE_IPM_G723, RESOURCE_IPM_G726, and RESOURCE_IPM_G729. 3. Offer the reserved coders to the remote side. 4. The remote side selects G.723 and G.726. Dialogic ® IP Media Library API Programming Guide and Library Reference 31 Dialogic Corporation 7
Page 1 and 2: Dialogic ® IP Media Library API Pr
Page 3 and 4: Contents Revision History . . . . .
Page 5 and 6: Contents 16 Using the Selective Pac
Page 7 and 8: Contents CT_DEVINFO - channel/time
Page 9 and 10: Figures Contents 1 IP Media Archite
Page 11 and 12: Revision History This revision hist
Page 13 and 14: Document No. Publication Date Descr
Page 19 and 20: About This Publication The followin
Page 21 and 22: 1.Product Description This chapter
Page 23 and 24: Refer to the following Global Call
Page 25 and 26: Table 1. High-Level Feature Support
Page 27 and 28: 4.State Models This chapter describ
Page 29: Event Handling ATDV_LASTERR( ) erro
Page 33 and 34: 7.3 Reserve Resources for Inbound C
Page 35 and 36: Figure 5. Reserve Resources Implici
Page 37 and 38: Reserving Resources for Audio Coder
Page 39 and 40: 8.Using the AMR-NB Audio Coder This
Page 41 and 42: Using the AMR-NB Audio Coder Frame
Page 43 and 44: Using the AMR-NB Audio Coder 4. Sin
Page 45 and 46: Using the AMR-NB Audio Coder ipmMed
Page 47 and 48: NBUP_PROFILE_G711ALAW64K_20MS G.711
Page 49 and 50: Using AMR-NB and G.711 Audio Over N
Page 51 and 52: 10.3 Usage Guidelines H.263 Using R
Page 53 and 54: See RFC 3558 for details of these f
Page 55 and 56: 12.2 API Library Support Configurin
Page 57 and 58: Figure 9. Half- and Full-Duplex Med
Page 59 and 60: } Configuring for Half- or Full-Dup
Page 61 and 62: 13.2 Setting DTMF Parameters This s
Page 63 and 64: IPM_PARM_INFO parmInfo; unsigned lo
Page 65 and 66: 13.2.5 Setting Receive-only RFC 283
Page 67 and 68: 14.T.38 Fax Server 14 This chapter
Page 69 and 70: Figure 13. T.38 Fax Server Call Sce
Page 71 and 72: } ipm_handle_disconnected = true; i
Page 73 and 74: } } if( sr_enbhdlr( ipm_handle, EV_
Page 75 and 76: 15.2 Implementation Guidelines Impl
Page 77 and 78: #define NUMCHAN 2 class CHANNEL //
Page 79 and 80: Implementing Native T.38 Fax Hairpi
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Implementing Native T.38 Fax Hairpi
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Using the Selective Packet Filtrati
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17.2 QoS Alarm Types Quality of Ser
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17.4 QoS Event Types Quality of Ser
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Quality of Service (QoS) Alarms and
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Figure 15. QoS Scenario 2: True Ala
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Register event handler function wit
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} /* . . . . */ } Quality of Servic
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Quality of Service (QoS) Alarms and
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18.3 Implementing Volume Control Vo
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} } ipm_GetParm(nDeviceHandle, &par
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Using Echo Cancellation With echo c
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20.3 Example Code 1 for NAT Travers
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} } Using NAT Traversal in SIP Medi
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Using Secure RTP For encryption, th
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21.3.3 Usage Restrictions Using Sec
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Using Secure RTP QOSTYPE_SEC_MKI_NO
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21.8 Use Case for Secure RTP Figure
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} MediaInfo.MediaData[1].eMediaType
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Building Applications libpthread.so
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23.2 I/O (Input/Output) Functions T
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Function Summary by Category Table
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ipm_Close( ) close an IP channel de
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ipm_DisableEvents( ) disable IP not
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IPMEV_ERROR Indicates that the func
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ipm_EnableEvents( ) enable IP notif
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IPMEV_ERROR Indicates that the func
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ipm_GenerateIFrame( ) generate an I
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} � See Also None. void CheckEven
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etrieve capability (for example, co
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ipm_GetCTInfo( ) return information
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ipm_GetLocalMediaInfo( ) retrieve p
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EIPM_SYSTEM System error � Exampl
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ipm_GetParm( ) retrieve the current
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} retrieve the current value of a p
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� Cautions None. � Errors retri
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ipm_GetQoSThreshold( ) retrieve QoS
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} retrieve QoS alarm threshold sett
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ipm_GetSessionInfo( ) retrieve stat
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} } /* . . Perform Error Processing
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ipm_GetSessionInfoEx( ) retrieve RT
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etrieve RTCP data for a session —
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ipm_GetXmitSlot( ) return TDM time
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} /* . . . continue . . */ return T
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� Cautions None. � Errors send
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send a response to an Nb UP invitat
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{ send a response to an Nb UP invit
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� Cautions None. � Errors send
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send an Nb UP initialization messag
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send an Nb UP initialization messag
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IPMEV_ERROR Indicates the function
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ipm_ModifyMedia( ) modify propertie
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modify properties of active media s
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} /* . . continue processing . */
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� Termination Events open an IP c
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ipm_ReceiveDigits( ) enable the IP
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} /* . . Main Processing . . */ ena
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ipm_ResetQoSAlarmStatus( ) reset Qo
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} /* . . Continue Processing . . */
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� Errors The function returns an
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} � See Also generate master and
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� Errors generate digits to the T
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ipm_SetParm( ) set value for specif
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void CheckEvent() { int nEventType
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� Cautions change QoS alarm thres
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ipm_StartMedia( ) set media propert
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EIPM_SYSTEM System error set media
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set media properties and start the
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� Cautions None � Errors stop o
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ipm_UnListen( ) stop listening to t
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} /* . . Continue processing . . */
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Events IPMEV_GET_LOCAL_MEDIA_INFO S
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Events IPMEV_SEND_DIGITS Successful
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Data Structures IPM_QOS_ALARM_DATA
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channel/time slot device informatio
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audio coder properties used in an I
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audio coder properties used in an I
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audio coder options — IPM_AUDIO_C
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IPM_CLOSE_INFO reserved for future
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IPM_ENDPOINTID_INFO endpoint ID inf
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IPM_EVENT_INFO used for IP event no
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IPM_IFRAME_INFO retrieve I-Frame in
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IPM_INIT_RECEIVED inbound IP initia
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IPM_INIT_SEND IP initialization mes
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parent of port and coder info struc
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IPM_MEDIA_INFO parent of IP_MEDIA,
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IPM_NBUP_INIT_FAILURE Nb UP protoco
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IPM_NBUP_INIT_RESPONSE response to
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IPM_NBUP_NACK_SENT NACK response to
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IPM_NBUP_PROFILE_INFO type of Nb UP
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IPM_NBUP_SUBFLOW_INFO attributes of
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IPM_PARM_INFO used to set or retrie
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used to set or retrieve parameters
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used to set or retrieve parameters
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IPM_QOS_ALARM_DATA data associated
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parent of QoS alarm data, contains
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QoS alarm threshold settings for an
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QoS alarm threshold settings for an
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IPM_RTCP_SESSION_INFO session infor
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IPM_SECURITY_BASE64_KEY Base64-enco
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IPM_SECURITY_INFO security informat
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contains security key info — IPM_
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IPM_SESSION_INFOEX RTCP data typede
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typedef enum { IPM_CRYPTO_AES_CM_12
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IPM_TELEPHONY_EVENT_INFO details of
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IPM_TELEPHONY_INFO telephony inform
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IPM_VIDEO_CODER_INFO video coder pr
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additional video coder properties
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SC_TSINFO TDM bus (CT Bus) time slo
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Error Codes EIPM_INV_DEVNAME Invali
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International Telecommunications Un
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