evidentiary hearing. Ordinarily, a district court is empowered to enforce a settlement agreement through summary proceedings. Callie v. Near, 829 F.2d 888, 890 (9th Cir.1987); see also Russell v. Puget Sound Tug & Barge Co., 737 F.2d 1510, 1511 (9th Cir.1984). However, where the parties dispute the existence or terms of the agreement, an evidentiary hearing is required. Callie, 829 F.2d at 890. Since Raymark disputes the facts that formed the bases for the district court’s finding of a contract and equitable estoppel, it was entitled to an evidentiary hearing.
Raymark complains that the September 4, 1987, hearing “was in the nature of a summary enforcement.” Essentially, Ray-mark bases this characterization on its mis-perception of the scope of the proceeding. According to Raymark, “[t]he proper scope of the hearing was to determine if the alleged settlements could be summarily enforced.” “Since Judge Peckham had twice decided that the alleged agreements could not be enforced,” reasons Raymark, “there seemed to be little reason for another hearing.” Consequently, Raymark only produced one witness during the hearing.
Raymark’s misunderstanding of the scope of the proceedings cannot be squared with the record. In his introductory remarks at the September 4th hearing, the district judge informed the parties that he would probe theories of enforcement that were not before Judge Peckham. He stated:
It’s possible, for example, that Ray-mark, not Raymark’s counsel, but Ray-mark, Inc., may have accepted this settlement by its actions or inactions....
I don’t think there’s any question under anybody’s contract law that you can designate anything you want to as an acceptance of any offer. If you agree to it beforehand, you can accept an offer by scratching your right ear or anything, or being silent for two or three days when you have a duty to speak out.
The judge, therefore, made plain that the alleged settlement agreement might be enforced on the theory that Raymark accepted the plaintiffs’ offers by silence. This legal theory was reiterated, and the possibility of equitable estoppel was introduced, at the close of Raymark’s counsel’s opening remarks. The judge admonished Gerry:
But the last few remarks made by Mr. Trapani [Raymark’s counsel] are certainly impressive. You have Blanton versus Womancare; you have Judge Peckham’s interpretation of that case, which doesn’t seem to be wrong to me.
So it seems to me that if you’re going to prevail in this motion, you’re going to have to point out to me some other way that Raymark becomes bound, either by contract, by estoppel, or some way.
I thought maybe that these notices had gone directly to the Raymark People, not only to Doug Wah, but also to Raymark responsible personnel, perhaps imposing upon them a duty to speak out. (emphasis added).
Raymark, therefore, had notice that the purpose of the hearing was not to rehash the theory of settlement authority, which had been decided by Judge Peckham. Nevertheless, Raymark failed to object to the nature of the proceedings, until its motion for reconsideration.
In his order denying reconsideration, the judge persuasively reasoned:
Raymark did in fact receive an eviden-tiary hearing on the issue of formation of the settlement agreement. The court notified the parties that it would receive any testimony that the parties wanted to offer. There was no limit placed on the number of witnesses the parties called. Raymark only called Mr. Bondonno to testify. There is no explanation as to why the other witnesses that Raymark now considers so crucial were not subpoenaed to appear at the initial hearing. Nor did Raymark state that it wanted to offer additional testimony. Further, Raymark participated in the evidentiary hearing without objection, and cross-examined Ms. Hughes, Mr. Wah, and Mr. Gerry.
The district judge thus imposed no limitations on the number of witnesses that Ray-