Editing Caller ID (section)

=== Other signaling methods ===
Not all types of caller identification use 202-type modulation, nor do all systems send the information between the first and second ring. As a result, not all caller ID devices are compatible from country to country or within the same country, even though the basic phone system is the same.

Besides Bell, the most common on-hook caller ID standard is European standard ETSI EN 300 659-1, which defines three caller ID ("PSTN display") protocols:<ref name="300.659.1">{{cite web |title=Draft ETSI EN 300 659-1 V1.3.1 (2000-09) Access and Terminals (AT); Analogue access to the Public Switched Telephone Network (PSTN); Subscriber line protocol over the local loop for display (and related) services; Part 1: On-hook data transmission |url=https://www.etsi.org/deliver/etsi_en/300600_300699/30065901/01.03.01_40/en_30065901v010301o.pdf |website=etsi.org |access-date=20 November 2023 |date=September 2000 |archive-date=November 20, 2023 |archive-url=https://web.archive.org/web/20231120030545/https://www.etsi.org/deliver/etsi_en/300600_300699/30065901/01.03.01_40/en_30065901v010301o.pdf |url-status=live }}</ref>
* [[ITU-T V.23|V.23]] mode 2 (a different FSK protocol; without using the 75-baud reverse channel), after a normal ring.
* V.23 mode 2, before the ring, but after a special alerting signal (a dual-tone, a short ring "pulse", or a [[line reversal]] followed by a dual-tone).
* A [[DTMF]] signalling using the 16 standard dialing tones.

EN 300 659-2 expands the standard to "on-hook" (call-waiting) situations, still using V.23.<ref>{{cite web |title=ETS 300 659-2 Public Switched Telephone Network (PSTN); Subscriber line protocol over the local loop for display (and related) services; Part 2: Off-hook data transmission |url=http://affon.narod.ru/Phoneline/300659-2.pdf |date=September 1997 |access-date=November 20, 2023 |archive-date=November 20, 2023 |archive-url=https://web.archive.org/web/20231120030545/http://affon.narod.ru/Phoneline/300659-2.pdf |url-status=live }}</ref>

The Chinese caller ID standard of 1997 is largely similar to Bellcore (with the "type II" extension).<ref>{{cite web |title=电话主叫识别信息传送及显示功能的技术要求和测试方法 |url=https://kosen.com.cn/news/download/cid/FSK.pdf |date=1997-12-03 |access-date=November 20, 2023 |archive-date=November 20, 2023 |archive-url=https://web.archive.org/web/20231120030546/https://kosen.com.cn/news/download/cid/FSK.pdf |url-status=live }}</ref>