====================!" == Technical Specification of the SIP (Gm) interface between the User Equipment (UE) and the NGN platform of Deutsche Telekom

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1 Technical Specification of the SIP (Gm) interface between the User Equipment (UE) and the NGN platform of Deutsche Telekom 1 TR 114 Version: Amendment 8 (Clarification on use of T.38 and Overlap Signalling) 11. May 2018 ====================!" ==

2 Herausgeber / Publisher Deutsche Telekom AG Verantwortlich/ Responsible Deutsche Telekom Technik GmbH Fixed Mobile Engineering Deutschland Abteilung FMED Darmstadt Bestellangabe / Order Information Kurztitel / Title: 1 TR 114 Ausgabe / Version: Amendment 8 (May 2018) Erweiterung für / Amendment for 1 TR 114, Ausgabe / Version (June 2013 ) Bezugsanschrift / Order address Internet Download: Kopie und Vervielfältigung verboten / Copying and duplication prohibited Gültig ist immer die aktuelle Bildschirmausgabe des Deutschen Telekom-Servers / Only the current release on the Deutsche Telekom server is valid 2018 Deutsche Telekom AG, Deutsche Telekom Das Werk ist urheberrechtlich geschützt. Die dadurch begründeten Rechte, besonders die des Nachdrucks, der Übersetzung, des Vortrags, der Entnahme von Abbildungen und Tabellen, der Funksendung, der Mikroverfilmung oder der Vervielfältigung auf anderen Wegen und Speicherung in Datenverarbeitungsanlagen bleiben, auch bei nur auszugsweiser Verwertung, vorbehalten. Die Bedingungen und die Vergütung für die Vervielfältigung einzelner Regelwerke der Deutschen Telekom AG oder von Teilen davon für literarische Zwecke sind im jeweiligen Einzelfall mit den im Impressum angegebenen verantwortlichen Stellen abzusprechen.

3 1 Scope This Amendment is an addition to 1 TR 114 V3.0.0 Markings general used within the TEXT: Text modified due to Deutsche Telekom requirements that is added or deleted compared to 1 TR 114 is shown as cursive and underlined (example for added text) or cursive and stricken (example for stricken text). 2 Support of T.38 within Deutsche Telekom IMS Network TR 114 clarifications Reference [32] shall be replaced by: [32] ITU-T T.38 (11/2015): TERMINALS FOR TELEMATIC SERVICES; Facsimile Group 3 protocols; Procedures for real-time Group 3 facsimile communication over IP networks For details on security issues (encryption) please see 1TR114 Amendment 2 (secure VOIP) The text shall be modified as follows: Fax and Modem For Fax and Modem transmission over IP, ITU-T Rec. V.152 [33] (based on G.711a [26]) shall be used. If the adjacent endpoint does not support ITU-T Rec. V.152 [33], Fax- and Modem connections shall be set up using G.711a (ITU-T Rec. T.30 [31]). Currently, ITU-T Rec. T.38 [32] is not supported by the NGN platform of Deutsche Telekom. For IMS UE to IMS UE communication the negotiation of T.38 regarding ITU-T Rec. T.38 (Edition 7) [32] is supported by the IMS/NGN platform of Deutsche Telekom. An interworking of T.38 [2] towards PSTN is not supported. Interconnection with other carriers and mobile networks is dependent on the support of T.38 [32] in their network. It is strongly recommended to implement the following codec negotiation scheme. 1. The originating UE (A-Side) send an initial INVITE with G.711 Faxcall towards the B-Side. 2. UE (B-Side) answers with 180 RINGING/200 OK INVITE. 3. Upon detection of facsimile by the receiving UE (B-Side), a SIP RE-INVITE request is sent to the originating UE (A-Side) of the initial INVITE (with the same Call-ID as the existing voice connection) for an ITU-T T.38 facsimile connection. 4. In cases where the UE (A-Side) which has sent the initial INVITE is not supporting T.38 a 488 shall be sent. However, the use of T.38 of the RE-INVITE does not cause the existing call to fail - the session continues using the previously negotiated characteristics. i.e Fax call using G.711.

4 Deutsche Telekom is not responsible for non-successful negotiation of T.38 regarding incompatible T.38 implementations. Therefore, it is recommended that T.38 implementations support at minimum ITU-T Rec. T.38 Edition 7 to avoid interoperability problems with other T.38 implementations. Support of end to end negotiation within Deutsche Telekom IMS will start at some time in Further information about the support of T.38 in the IMS network of Deutsche Telekom is given under the following web address: Example of SDP sent within the RE-INVITE: === Session Description Protocol === Session Owner/Creator and session id : o= IN IP Media Name : m=image udptl t Callflow T.38 (informative) UE-A UE-B INVITE SDP G711, G711 VDB 180 Ringing 200 OK ACK RE-INVITE SDP m=image udptl t OK

5 3 Clarification on Overlap Signalling TR 114 clarifications The following text in Section Global modifications to 3GPP TS Release 11 shall added be as follows: The use of overlap signalling as defined in 3GPP TS shall not be supported at the Gm interface. i.e. neither multiples INVITES nor the in-dialog method shall be used. Overlap dialling shall be converted within the UE to en-block (i.e. complete request URI). A dialled # should be interpreted as end of dialling. Mechanisms to identify the end of dialling within the UE may be used like: - Receipt of the maximum number of digits used in the national numbering plan. - Analysis of called number based on an implemented directory. - Analysis of called number based on already successful called numbers. - Adaptive inter-digit timer. Version Published Remarks locating P-CSCF and correct prioritization of P-CSCF in case of registration including maintenance procedures. -Preconditions support "passive" better described -Early-Media Header and indication of early media described to avoid misinterpretation. And allow handling of calls initiated by mobile devices. - use of from-change. No default setting - deletion of Annex A - Update of Annex B - Deletion of TS UPDATE to 3GPP Release 11 documents -Correction of *# Procedures using PIN (ECT, OCB, Kick Out, Black List, White List, ACR, CB, ICB) - CLIR 3 included in D Documentation Update TIP/TIR and OIP/OIR -MWI voided - Documentation Update of " 8.6 Support of NAT traversal by the

6 Version Published Remarks UE" -MIME Type UPDATE Table 7-5 -UPDATE Table 7-4 SIP Headers - add references TR-069, TR-104 and TR add reference 3GPP TS C.2.8 allow implementations acting on "application/vnd.3gpp.cw+xml" All changes are backward compatible with the procedures described within 1 TR 114 Version Amendment Clarification on use of T.38 and Overlap dialling

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