pcap → SIPp UAC scenario

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UDP or TCP signaling, no TLS · one Call-ID at a time · if several host pairs share it you pick the UAC → UAS flow · UAC = side that sent the first request of that flow

Call

Scenario name

Preserve inter-message timing as <pause> blocks

Synthesize PRACK for reliable 183s that have none (opt-in)

Statistics

Ladder

Target & run

Remote address

Port

Attempts

Transport (from capture)

Generate scenario as

As captured

UDP (Via, ;transport= params, run command)

TCP (Via, ;transport= params, run command -t t1)

Generation notes

Run against SBC

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What gets templated vs. kept literal

Call-ID → [call_id]; UAC Contact host:port → [local_ip]:[local_port]. Compact header names (i:, v:, f:, t:, m:, …) are recognized and rewritten to long form.
UAC From tag → original tag text + -[call_number] (unique per run, keeps the original tag recognizable).
UAC Via → transport (UDP/TCP) preserved from the capture, extra Via params (e.g. rport, alias) kept; branch → literal token reused identically across every UAC message that shared the same branch (required for CANCEL and ACK-to-non-2xx).
To-tag on CANCEL → omitted. To-tag on ACK → [peer_tag_param], which SIPp expands to ;tag=<value> or empty string as appropriate.
ACK-to-2xx vs ACK-to-non-2xx is decided per transaction, matched by CSeq.
Re-INVITE (any UAC INVITE after the first, matched by incremented CSeq in the same Call-ID) is emitted as an in-dialog <send> with the SIPp [routes] pseudo-header, its own branch, and an annotation in the XML.
RFC 3312 precondition flows are detected when a 183 carries Require: 100rel, an RSeq header, and SDP with a=curr:qos/a=des:qos/a=conf:qos. A missing PRACK is a warning by default. Tick Synthesize PRACK to opt in to generating one (and its 200 OK) from the 183's RSeq and the INVITE's CSeq; every synthesized message is annotated in the XML.
Retransmitted messages are suppressed (duplicate method+CSeq+branch for requests; status+CSeq+RSeq+To-tag for responses).
All 1xx responses are emitted with optional="true", except the last non-100 provisional before a subsequent <send>, which is auto-promoted to mandatory (falling back to the last provisional if only 100 Trying is available).
Once Record-Route is seen on a ≥180 response, subsequent in-dialog UAC sends include the SIPp [routes] pseudo-header (except CANCEL and ACK-to-non-2xx).
SDP o=/c= IP → [media_ip]; m= ports → [media_port] / [media_port_N]; a=rtcp: templated to match.
If the capture is truncated at an INVITE final response, an ACK is synthesized.
Timing preservation (optional, off by default) prepends a <pause milliseconds="N"/> before each message whose delta to its predecessor was ≥ 5 ms. Capped at 5000 ms per pause.