Unified SRST/E-SRST 14.3 Supported Firmware, Platforms, Memory, and Voice Products

Publisher

Cisco Systems

URL

https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/cusrst/requirements/guide/srs143spc.html

Published

2023-11-30

Updated

unknown

Accessed

2026-09-25

HTTP status

200

License

Cisco documentation; all rights reserved; no-redistribution; short excerpts and locators only

Source notes citing this source

• The Catalyst 8000V does not support FXO or T1/E1 PSTN trunk configurations for SRST. in context
• For SRST/E-SRST 14.3, the Catalyst 8000V supports 500 phones (small), 1,000 phones (medium) or 2,000 phones (large), with 2,000 lines in each size. in context
• For SRST/E-SRST 14.3, the C8200-1N-4T and all four listed C8300 models support 2,500 phones and 3,500 lines, while the C8200L-1N-4T supports 1,500 phones and 2,500 lines. in context
• For SRST/E-SRST 14.3, the ISR 4321 supports up to 50 phones and 200 phone lines (the same as the ISR 1100). in context
• For SRST/E-SRST 14.3, the ISR 4331 supports 100 phones / 400 lines and the ISR 4351 supports 700 phones / 1,000 lines. in context
• For SRST/E-SRST 14.3, the ISR 4431 supports 1,200 phones and 1,800 lines. in context
• The 14.3 compatibility document lists the ISR 4451 and ISR 4461 at 2,000 phones and 2,500 lines, while the 2022 SRST data sheet lists the ISR 4451-X at 2,000 phones and 3,500 lines. disputed in context
• SCCP and SIP phones can be mixed on one SRST router, provided that the combined total does not exceed the platform's listed maximum. in context
• Unified SRST/E-SRST 14.3 is supported only on platforms running Cisco IOS XE Cupertino 17.9.1a and later. in context

Cite this source record

APA

WarmTransfer. (2023, November 30). Unified SRST/E-SRST 14.3 Supported Firmware, Platforms, Memory, and Voice Products. WarmTransfer. https://warmtransfer.net/knowledge/sources/cisco-srst-143-platforms-memory

BibTeX

@misc{warmtransfer-cisco-srst-143-platforms-memory,
  title  = {Unified SRST/E-SRST 14.3 Supported Firmware, Platforms, Memory, and Voice Products},
  author = {{WarmTransfer}},
  year   = {2023},
  url    = {https://warmtransfer.net/knowledge/sources/cisco-srst-143-platforms-memory},
  note   = {Cisco Systems, accessed 2026-09-25}
}