BYOC with Talkdesk: Requirements & Limits

While Talkdesk BYOC is an advanced and highly adaptable solution, we recommend taking into account the following requirements and limits:

 

Availability

BYOC is available in the following regions: US, EU, APAC, and LATAM.

Number format conventions

Talkdesk BYOC SIP trunk establishment requires the E.164 number format with the following number convention:

  • ‘+’ ‘CC’ ‘NDC’ ‘SN’ (international)

  • ‘NDC’ ‘SN’ (national)

CC = Country Code

NDC = National Destination Code, identifying one or part of a PLMN (Public Land Mobile Network)

SN = Subscriber Number

Media and Signaling Cyphers and Crypto

  • Supported TLS Version: TLSv1.2 only. TLS v1.1 or previous is not supported.

  • Supported SIP Transport (SIP over TLS) Cipher Suite:

    • TLS_ecdhe_rsa_with_aes_256_cbc_sha384

    • TLS_ecdhe_rsa_with_aes_128_cbc_sha

    • TLS_rsa_with_aes_128_cbc_sha

  • Supported Media Transport (SRTP) crypto-suite:

    • AES_CM_128_HMAC_SHA1_80

    • AES_CM_128_HMAC_SHA1_32

  • No encryption: not recommended and requires an explicit written agreement. 

Security & Encryption

  • Supported encryption methods:

    • TLS 1.2

    • IP Sec tunneling

    • AWS Direct Connect using TLS

  • No encryption: not recommended and requires an explicit written agreement.

SHAKEN/STIR

Inbound and Outbound verification are not provided by Talkdesk as this is the carrier’s responsibility. Only applicable in the US.

Outbound calls to extensions

  • Outbound extension dialing is supported by BYOC for most use cases. Please contact your Talkdesk representative for more details.

Transcoding 

Transcoding is not accepted.

CNAM (Caller Name)

CNAM should be requested from the terminating carrier.

Outbound calls via toll-free numbers

In most countries and regions outside North America, toll-free numbers are considered an inbound-only service from a regulatory perspective.

Therefore, Talkdesk does not recommend they are used for outbound calls, outside of North America. Please verify the usage of toll-free numbers with the terminating carrier.

Redundancy

Redundancy with Talkdesk Points of Presence (PoP) is mandatory for BYOC adoption. Applicable to all Talkdesk PoP regions.

Distinct IP addressing for media and signaling 

No media anchoring on the SBC is allowed. All the media must be anchored on the architecture media servers, which means that distinct IP addressing for the signaling and the media must be supported by the carrier.

MKI (Master Key Identifier)

MKI is not supported. This parameter must not be presented in the SDP crypto.

Lower case RFC MD5

The MD5 key configuration must be lower case. Upper case MD5 is not compatible.

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