> For the complete documentation index, see [llms.txt](https://prosbcdocs.telcobridges.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://prosbcdocs.telcobridges.com/telecom-references/sip-and-voip/signaling-interworking.md).

# Signaling Interworking

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#### Common feature

DTMF relay

Reason Cause Mapping

Display information

Call transfer (SIP REFER)

Fax/Modem relay

Call progress tone

Play announcement

Privacy mapping (SIP Privacy Headers)

#### SS7/SIP

Profiles->SS7 Profile Params->Forward call indicator (international)

Profiles->SS7 Profile Params->Send LPA when continuity check is required

Profiles->SS7 Profile Params->Send charge number IE in IAM

Profiles->ISDN Profile Params->Send display IE

Early Media (call proceeding to SIP 183)

LNP relay

IE mapping

SIP-I

Overlap receiving -> en block

#### ISDN/SIP

Profiles->ISDN Profile Params->Information transfer capability

Profiles->ISDN Profile Params->Send display IE

UUI Support

ISDN Interworking Redirection (sip diversion)

Early Media (call proceeding to SIP 183)

Overlap Signaling

IE mapping

#### SS7/SS7

COT


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